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I'd like to model the hydraulic effect of the implementation of beaver dam analogs (BDA) in a stream using HEC-RAS. For that, I need to establish a relationship between the water level upstream the structure and the outflow downstream the structure (based on Darcy's law). The missing element here is the permeability coefficient (k) of the composite of sediments and organic materials that forms that kind of structure. I wonder if the evaluation of that coefficient has ever been made in the past for beaver dams or BDAs. Would it even be ok (for restoration purposes) to establish a mean value for that coefficient and use it widely in order not to repeat such measurement for each project?
the detail is about that when i create a model which can predicts the stability of landslide dams with missing values.I know that XGB or lgb model is good at dealing with missing data ,but i dont know if the missing values are more in the training data or in the test data may bring uncertainty to my result. I've tried lots of times , the result deffers from the random state I set when I do the train_test split. Some time the AUC of test can be 90%, some time it is 69% even.
i tried make a progress to the lgb model .I replace the loss funtion of lgb by Focal loss ,and it doesn't make sense ,I have no idea what i can do next
When was Dagotierre Dam, Eu Bleu, Valette Dam constructed?
am working my research on evaluation of seepage and slope stability analysis of embankment dams . the dam is under construction and the dam clay core made slide due to different reasons. some of the reasons are up stream pond ,and there is also water inside clay core .
Hello everyone, I am learning how to drawing geometry earth dam on flac 3d. I have a problem with bad blocks. I cant make zone because notification says "bad blocks". I started draw 2d geometry dam on extrusion pane then i use autozone tool and blocking tool. And then i extrude the geometry. I do the same thing when i draw geometry canyon. After dam and canyon have extruded, i go to building blocks and combine the dam and canyon so there are intersection between dam and canyon blocks.
Have I done the right steps? could anyone tell me the right step for drawing 3d geometry dam and canyon? Thank you
The end of the foundation drain is in the third upstream of the contact surface dam/Foundation. The other end is related to a drainage tunnel located in the the downstream toe. Does anyone have an idea of how to model this drain in Plaxis 2D and manage to minimise the drawdown pressures of 66% as expected?
Artificial dam and coal pillar dam of underground reservoir in coal mine have great differences in material, thickness and stress. In addition to establishing similar model, how to carry out test to study the stability of their combination?
Most dams are designed with traffic lanes that could be used by regular vehicules or mobile cranes for example. Why isn't this type of loading considered in the stability analysis of dams?
I'm trying to interpret poorly explained data I found in the literature .
The problem is wadi flash floods and a recharge dam.
I want to try to determine the amount of water which overflowed the recharge dam given the dam's capacity, the maximum reservoir level, and the magnitude of the flash flood.
The author writes: "The surface inflow volume is measured by a wadi guage about 1 km upstream of the dam while the volume of water captured by the dam is measured by reservoir level at the dam site. Using the two measurements the volume flow over the dam can thus be determined."
In the Table, row 1 has the following data:
1. Flash flood date: Jan 28, 1992
2. Max reservoir level (mamsl): 808.34
3. Peak discharge (m3/s): 138.5 [From the value this appears to be L/s not m3/s]
4. Flow volume inflow (Mm3/s): 1.0786
5. Flow volume over (Mm3/s): 0.2508 [I can't figure out how the author determined this value.]
1. Recharge dam is at an altitude of 600 (mamsl)
2. Recharge dam has a capacity of 0.68 million cubic meters.
However, the frictional sliding or horizontal movement could also be taken into account!
I need to extract mode shapes and damping ratios from ambient vibration measurement we have performed on a dam (2 setups with 6 sensors). Would you have any suggestions for an open source code that works well to perform such analysis (a code with similar capabilities than the commercial software Artemis)?
I need a water quality-quantity model for improving the water quality of the Amirkabir dam, and I don’t know considering the limitations and advantages of both models: SWAT and MIKE 11 which one would be a better choice?
I know that tensile strength can reduce crack length in a dam joint, but does it help fix overturning of a dam? or is it necessary to use post-tension anchor to fix overturning.
I am trying to perform a seepage analysis of an earthen dam modelled in the picture attached. The said dam was built about 35 years ago and still holds good today. The average water depth on its upstream side (Left Hand Side) is 6.6 meters . And the downstream face (Right hand side) has no apparent face of seepage.
How can I correctly assign the boundary conditions of the dam to analyze the seepage within the dam and to check for its safety and also find the flux within the earthen dam.
I am working on numerical modeling of a two-phase model for the sediment transport problem based on the SPH method.
According to previous research and works, none of them mentioned the calibrasion of numerical models and only the validation of the models were done by comparing the numerical results with the laboratory results of common samples such as dam break test cases.
Is calibrasion required for such numerical model?
What is the best option for the calibrasion of results from this numerical modelling?
I am going to evaluate the ecosystem services of a section of river wetland in Southwest China, and then predict the impact of damming on its ecosystem services in the future. I'm not sure whether the InVEST model can implement my idea.
My research site is a floodplain wetland and now it is a scenic spot with good scenery. A hydropower station is planned to be built in the downstream of the wetland. The wetland will be submerged after damming and the original landscape of flood wetland will turn into an artificial reservoir. Definitely, the construction of reservoirs will also change other ecological functions of wetlands, such as biodiversity, climate regulation, flood equalization and so forth.
My chief purpose is to predict and assess the ecosystem services of wetland after hydropower construction, in order to provide guidance for decision making of the engineering design. According to my above description, can InVEST achieve my expectations? Which else models do you recommend me?
Thanks all in advance!
Damming impacts have been identified as the largest anthropogenic hydrological projects on the natural flow conditions. Many researchers have analyzed the hydro-ecological state of floodplain wetlands downstream of a large dam before and after its construction. But how to evaluated the ecological-function variation of wetland in the tail area of the reservoir (upstream of the dam) ? For example, a wetland changed from floodplain wetland to riverine wetland because of submerge after damming in its downstream. How the wetland ecosystem changed after damming? How to optimally operate the reservoir in order to protect the wetland as far as possible?
Can anybody recommend me some good study cases?
I m working in a project on a DAM to find the sedimentation rate of inlet and sedimentation rate and behavior of sediment particles on DAM bed Level. I m grateful if any one recommend open source software for this research.
we need studies about Makhool Dam by hydraulic, geology and hydrology studies
How to perform sensitivity analysis for dam/reservoir site suitability mapping? if we have considered some parameters (i.e. elevation, slope, distance to the river, geology, geomorphology). So, by using AHP we have done overlay analysis in Arc GIS to develop a suitability map. However, if the dam or reservoir is not constructed, how we can validate the model/resulted maps.
The location of DAM has been obtained by using AHP techniques. As a result, I have prepared the dam/reservoir suitability map. Certainly, validation is a very important part of the model. If, any other dam site is not available/ not constructed in the study area. How can we validate? Is there any method or approach?. Furthermore, Is sensitivity analysis is required for the spatial layers utilized to prepare the dam site suitability map?
I m eagerly waiting for prompt and scientific answers to overcome this difficulty?
I am currently doing a dam stability analysis. I am analysing dam piers indepently of the spillway. According to the results, the piers are not stable in slip. But my design criteria are too conservative, because I did not take into account shear keys.
I tried to find documents on how to consider shear keys at the admissible limit state, but couldn't find anything. Can anyone guide me?
I have generated random fields for the cohesion of a certain layer constituting an earthdam using R code. Each realization is extracted as a text file. Yet when the text file is called in Flac, different values of cohesion are appearing (unreasonable ones).
Is there anyone familiar with this work, maybe i can share the code, and we'll try to figure out how to solve this issue.
Which distance and depth will be greatly influenced through seepage e.g. 10, 20 and 30m from dam 0.3, 0.6 and 0.9m deep.
hi, i'm civil engineer phd
my qustion about how i can include a prestressed in my systeme (dam) for a modal analysis with Ansys apdl
using genetic algorithm in schedule of rivers and canals also calculating capacity and yield of dams by optimal solution (optimization )
This is Dileep Kumar Chandragiri, Did my Masters in Structural engineering from NIT Allahabad, India in the year 2007. I have around 14+ years of experience as a structural engineer in India, with experience gained a lot of exposure to economic design and good detailing.
- I have hands on experience in Structural analysis, Design & Detail drawings of Hydro Power, Metro & Road Tunnels, Residential, Commercial, Educational & Industrial Building Structures.
- I'm planning to do Master's in earthquake engineering (Research) from New Zealand. I'm interestingly looking for exceptional concept/research work to do. Please guide/suggest me on the project selection/topic which will be more beneficial for career prospective based on my experience.
My Proposal :
The area of my experience always governs the earthquake design. The Design of all Hydro power projects are in high seismic zones (Himalayan region) and the area is porn to large earthquakes in India.
Dam, Intake and powerhouse operation sustainability is a major concern for the Hydro power Projects in India.
I would like to contribute to the field through meaningful research in Earthquake Engineering on “Seismic risk assessment of Hydro Power components Dam, Intake and Powerhouse". Which includes detailed structural modeling, risk analysis in order to develop high-level retrofit strategies to save loss of life.
Please suggest on my proposal as well.
I am working with dem images for morphometric analysis. I am using topotoolbox for Ksn calculation. In my study area there is several dams in a single river and when I am using topotoolbox, it is taking the stream reach between two dams as the longest river stretch resulting in an erroneous result. I wan to effect of the dam from the dem for further analysis.
We are aware that a shift in monsoon peak discharge may have an adverse impact on several water-based applications such as agriculture, dam operations, etc. E.g.
After using the sufi-2 to calibrate my data, the simulated data is very much overestimated. the problem is my basin is very large, about 23,124 km2. I did not include dams/reservoirs in my first simulation in ArcSwat since I did not have that information. Now the only information I have about the dams are the dams storage capacity (m3) and annual water abstraction for water treatment from the dams. I want to know, will only these two pieces of information work and will this improve my p-factor and r-factor and R2 values as the first simulations without dams are very poor.
Also, can I improve the p-factor value without including the dams in SWAT?
according to the manual of Plaxis 2D the calculation type Flow only can be only used to perform a groundwater flow analysis in both un/saturated soils and no stresses shall be obtained from such an analysis, while on the other hand the calculation type Plastic is used to perform a deformation analysis.
Does the Fully coupled flow deformation combine both types of calculation together? If the answer is yes, can we come to the conclusion that a Fully coupled flow deformation analysis gives the same seepage path/line obtained from a groundwater flow analysis ?
If the answer is no, is there anyway to obtain stress values out of a flow analysis or is ist possible to run a plastic analysis following a groundwater flow analysis?
Thank you in advance
I am working on dam and reservoir interacrion and the order of numbers in fluid mass matrix is E-7 which seems very little
aany one that remmember whats th order of numbers in mass matrix for a 120 meter rservoir ?
it is a big help for me
Globally, there are more than 45,000 large dams in operation in over 150 countries and another 1500 or so are currently under construction according to World Wildlife Fund (WWF). Dams and weirs have been built on rivers (a barrier across a river) to achieve a number of benefits including water storage, irrigation supply, drinking water, preventing floods, navigation, hydroelectricity production, and recreation etc. In recent time, most dam construction is taking place in the developing world, such as in China and India. 46 new large dams being planned or under construction in the Yangtze River basin in China; 27 in the La Plata basin in South America; 26 in the Tigris and Euphrates Basin in Turkey, Syria and Iraq. Dams are also planned on three other rivers: the Salween in China, Thailand and Myanmar, the Kizilirmak in Turkey, and the Ganges in China, Nepal, India and Bangladesh.
The development of engineering infrastructure such as dams and weirs over rivers has modified rivers ecosystems threatening the water quality (e.g. salinity, cold water pollution) and water dependent biodiversity (e.g. native fish). Dams disconnect rivers from their flood plains and wetlands, reduce water flows in rivers, and affect the migratory patterns of fish. In general, water retention by dams eliminates or reduces spring runoff or flood pulses that often play a critical role in maintaining downstream riparian and wetland ecosystems including the lifecycle of fish. Older dams release water that is stored at the bottom of the dam, which is typically colder and adversely affects species adapted to warmer temperatures. Such an effect is sometime referred to as ‘cold water pollution’. The construction of a dam on a river can block or delay upstream fish migration between feeding and breeding zones and thus may contribute to the decline and even the extinction of species. As a consequence of dams, for example, some unique species and habitats are/will be threatened including freshwater native fish, river dolphins, porpoises and water birds. One estimate reveals that dams and associated uses of water have altered two-thirds of the world’s major rivers.
In Australia, the Federal Government Department (Commonwealth Environmental Water Office) has acquired/is acquiring water with the goals/objectives to increase water flows in rivers and wetlands (commonwealth environmental water). Reduced flows in the Murray Darling Basin (MDB) have already caused environmental problems (increased salinity, increased algal blooms/cyanobacterial blooms, decline in native fish and bird populations and poor wetland health). This environmental water has been/is being recovered through water saving infrastructure upgrades, water purchases (direct buybacks of water entitlements from irrigators) and other water recovery programmes in order to protect or restore the environmental assets of the MDB. The environmental water will help protect and restore the resilience of the MDB’s rivers, wetlands, floodplains, lakes and red gum forests, together with the plants and animals that depend on them. In a number of countries (e.g. third world countries), people may not be familiar with environmental water or environmental flows and a need for environmental water for biodiversity.
Question: Do you agree that there is a need for environmental water/environmental flows to protect biodiversity where dams have been built or to be built? If so, how can we achieve a balance between water usages for consumptive purposes (drinking water, industry and irrigated agriculture) and meeting the demand for environmental flows for smooth functioning of river ecosystems and river biodiversity?
Hi fellow stuents and scientists,
I'm working on a small peatland (1.8 km2) with a stream traversed. The water quality was bi-weekly mointored at 10 sites in this 2 km stream. Water level and discharge was monitored at inlet and oullet as well. So we can say we don't lack data.
But since last year, beavers built a dam at outlet of this peatland, and the water level significantly increased. With this dam, the water didn't flow until the water level exceeded the dam height. So now I don't know how to model the discharge and water quality in this stream, because it is significantly different from a normal river, but more like a reservoir.
Can anyone give me suggestion on which model incorporates the dam construction, or how to model the in-stream water movement with this dam at outlet?
Thanks in advance!
There are many acetate quantification kits that are enzymatic, but use a probe readout.
"The intermediate reduces the probe to a colored product with strong absorbance at OD=450 nm."
A few examples are
How does this work? None of the protocols have the details.
Please share your opinion and understanding on landslide dam outburst floods
I want perform a time series analysis on real time data of hydropower/hydroelectric power generation of different dams of India.
Dear colleagues and Research Gate Users,
I am working on 2D hydraulic model of Tigris River downstream of Mosul Dam and now trying to calibrate my model. I really tried to get velocity profile data to use for validation but did not get any information or sources. Please, if any one has these type of data and would like to share with use>
Thank you so much.
I have listed factors of each animal (mammals) species rescued during a dam inundation such as "can swim/unable to swim", "arboreal/terrestrial", "cryptic/none cryptic", frequency of capture: "common/rare" etc. What analysis can be done in order to determine the contributing factors and grouping of characteristics of the animals that influences it to be rescued? I've been suggested Principle Component Analysis (PCA) but I'm also exploring other options out there.
Most of the technical specifications for concrete gravity dam require to decrease the grout consumption to reach < 3 lugeon value to determine the satisfaction of grouting consumption.
it seems to me not realistic because I can't find a direct relationship there.
Hi, I'm not that advanced when it comes to remote sensing I'm still learning, would you please help me to find a formula that i can use to calculate Chlorophyll-a Concentration using Landsat 7 and 8, specific, your help will highly be appreciated.
We are activating the expression of a gene by Cre mediated removal of a gene trap. Using a CreER driver we want to activate expression starting at E11.5. However after 1 injection with tamoxifen (1mg/10g mice) and progesterone (0.5 mg/10g mice) all our females (6 out of 6) were unable to deliver at E19.5/E20. Any tricks to circumvent this?
I ran the gel at 60 volts, and then 100 volts. By the time of completion the entire box was warm . I had it filled in and around the dam with about a liter of running buffer.
Is it possible that I can generate these curves manually. If yes then which data is required for these curves. and how these curves are generated? Or is it possible we can run the model without these curves?
In the U.S., Executive Order 13905( Federal Register : Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services) signed 02-12-2020, ordered several federal agencies to conduct vulnerability assessments related to critical infrastructure. I'm looking for qualified opinions / research on the potential for degradation or loss of access to GPS / GNSS to potentially impact critical infrastructure at hydro-electric dams.
The focus here is on the vibrations that result from the operation of electrical turbines in the dam. I hope to provide me with similar researchs and tutorials videos about software.
How to assess the socioeconomic impact of the dam with econometric models and if you want to compare the impact on the livelihood of the same community before and after the dam construction which method is easy and applicable.
I would like to estimate siltation in a dam using an indirect method. I wanted an equation that uses the area of the catchment, type of soil, inflow Q and the area of the dam.
are there models and program to routing of discharge from dams?
Has anybody been able to replicate finding of papers that show increased vocalization in mice pups after a brief period of interaction with their dam, also called maternal potentiation? We have tried a couple of different protocol in our lab and if anything in the second recording the number of vocalizations is lower than in the first recording. Any tips?
searching on program of excel and model to calculate flood routing from dams and rivers
The check dams used as torrent control works have some characteristics - in my opinion - which are neither quite those of retention dams (hydraulic structures) nor quite those of retaining walls. So, taking into account their behavior over their period of existence (50 to 100 years), a short period the check dam works as a hydraulic structure subject of hydrostatic/hydrodynamic pressures. Then, after the upstream sector is completely filled with sediments, it works as retaining wall, perodically submited to floods. I put this question because, verifying such a structure using Eurocode 7 I obtain larger dimensions than using the old global factors of safety. And a more than 100 years of experience shows that economically the last approach is better.
According with the experience and technical regulations in the European countries, are them subject of Eurocode 7 or of some special regulations?
effecting the dams construction in branch rivers and canals on amount of water in reservoir of downstream
working 5 scenarios of makhool dam by close and open dams in up streams
We are carrying out an assessment of the impacts of a dam in western Nepal to the wildlife in the area. We plan to delineate impact zones (high, medium and low) of the dam based on the increasing distance from the dam site or any other criteria however couldn't find any scientific basis to delineate.
I was wondering if there are any scientific criteria to delineate such zones?
The Microsoft Jet database engine could not find the object
Column 'DATE' does not belong to table tbITs
The first error occurs when using a .dbf and the second error occurs when using a text file.
Any help is greatly appreciated.
Please, how can I obtain all the experimental data used in Aeration and air–water mass transfer on stepped chutes with embankment dam slopes, Stefan Felder and Hubert Chanson?
While I'm working on a project about landslides on the Tibet Plateau, I encountered many large and valley-filling deposits that seem to be some kind of mass movement but cannot find their source areas.
The phenomenon is usually observed at 4000 - 5000 m elevation and many areas have permafrost. I attached two screenshots to show one of them which dammed the river (the only one that dammed river in the region). Many other cases can be seen around this area in the google earth kmz file.
I was told it might be slow sliding caused by underlain ice melt or remaining glacier tills. Can someone who has working experience in high-elevation areas identify what kind of phenomenon is it?
Thanks in advance
I’m working on the 'Concrete Damaged Plasticity' model in ABAQUS for RCC gravity dams, so I need 'Yield Stress' data according to' cracking strain ' or ' displacement ' and ' damage parameter ' According to' cracking strain ' or ' displacement ' for ' Tensile Behavior ' and also ' Yield Stress' according to 'inelastic strain' in 'Compressive Behavior', reading in the literature, I found these data set but for Conventional Concrete Dams ( CVC gravity dam ), since the RCC concrete doesn’t consist of the same materials as the conventional concrete dams and thus not the same behavior, from there, is there any data set for RCC concrete or numerical equations to apply, or otherwise I use data set of Conventional Concrete ?
I need some functions of volumetric water content vs matric suction, and unsaturated permeability vs matric suction, of representative soils used in earth dam construction. Will it be possible to obtain them from the granulometric curve of the soil?
I study on groundwater dams (subsurface and sand storage). I am looking for new examples on the application of slurry wall type groundwater dam. Is there a new publication you can recommend me?
A Dam having an age of 30 years persue a fracture longitudinal to the axis of dam what kind of treatment can be provided for the same.
I am doing a meta-analysis on the impact of humans on fragmenting freshwater ecosystems. I have collected locus-level data above and below dams to assess how expected heterozygosity (He), observed heterozygosity (Ho) and number of alleles (nAl) are reduced above dams. I don't have a genotype matrix to permute, but want to correct nAl for sample size. Can I just include sample size as a factor in the model to account for natural increase in nAl with sample size?
Please see example data, attached
I am trying to analyze Dam Breach in HEC-RAS Model. As per Manual of HEC-RAS they provide the guidance to for width parameter for Failure of Dam. but it gives an average width and we have to provide the Bottom width of failure at the time of Dam Breach.
please help me to convert the Average width to Bottom Width of Dam.
Recent publication in line with the asked question. As the commutation of silt or clays at the bed of dam reservoir produce a negative effect, ie causes the dam to fail and secondly it reduce the storage volume of reservoir.
To measure the presence of some peptides and hormones in the blood it is important to add, at time of collection to the serum/plasma samples, inhibitors of proteases.
At what final concentrations is it recommended to add the following inhibitors?
· DPPIV inhibitor (Millipore Corp or Sigma Aldrich Cat# DPP4 or DPP4-010): Stock solution ready to use, 10ul/ml of serum?
· Aprotinin (Sigma A6279): Stock solution at 10mg/ml (5-10 TIU/ml) and use in serum at a final concentration of 0.1 or 1mg/ml?
· Serine protease inhibitor (Roche Pefabloc Cat. # 11 429 868 001): Reconstitute a solution at 100mg/ml and use in serum at a final concentration of 1mg/ml?
· Protease Inhibitor cocktail (Sigma Cat# P2714 ): Reconstitute a solution at 100mg/ml and use in serum at a final concentration of 1mg/ml?
Thank you very much for your help!
Please, I would like to know if there is a function for the hydrological modeling of a small farm dam using the HEC-HMS software, if so, with which function can I do it please?
I would also know please, if there is any specific model for modelling this kind of process.
Thank you and a good day.
I am looking for observed water balance data for Roseires and Merowe dams during the period 2008 to 2012. I will appreciate for any help.
Thanks in advance
Hello, I'm looking for links to dams databases which contains information such as water supply, temperature, humidity, rainfall ... is there anyone who can help with this?
in this picture, there is only one station on the dam crest that records the data. (station DG2-B6)
If the earth dam has a core central deeper than the floor, do we calculate with drawing lines under all basis of the earth dam or selected points and collected the results?
please provide me technic calculate total uplift pressure.
I'm currently working on my dissertation which involves the mitigation of seepage under dams using cut-off walls. Until recently I assumed that using the groundwater flow graphs in the output tab, gave me a value of seepage, but it was brought to my attention that it wasn't that simple and that additional data needs to be input. I was wondering if anyone could help me with determining seepage, specifically under dams and how it travels?
It is the requirement of one project of location of the dams and rivers in the country.