Questions related to Fluvial Geomorphology
My study area is extremely large (multiple valleys) and precipitation is close to zero. Streams are often dry, but runoff almost solely comes from glacier melt and is heterogenous throughout the valleys. I have extracted stream boundaries for hundreds of basins using a machine learning algorithm and I can get channel geometry such as width/depth/cross sectional area (at any point along the stream), wetted perimeter etc. Is there any way I can get approximate velocity, discharge, etc at bankfull using stream geometry and a corresponding DEM? Maybe using slope and geometry?
I want to map these river geoforms with as little subjectivity as possible. I have a high resolution DEM generated by drone data.
I need to analyze the movement of a river's curves and predict its behavior in the future.
I have a case of a bend river with groynes. Is IRIC capable to do refinement?. I am working with NAYS2DH and FASTMECH modules.
According to Harel et al (2019), a drainage reversal is represented by obtuse angle of a river junction. Does anyone know about an algorithm that can detect them?
Harel, E., Goren, L., Shelef, E. and Ginat, H., 2019, Drainage reversal toward cliffs induced by lateral lithological differences: Geology, v. 47.
I would like to know the fast and easiest way to differentiate aeolian and fluvial silt by looking at the samples itself.
I need to map out the elements in the river in detail (wood, stones, gravel benches, sedimentary fractions ...). In previous mapping, I used river photography combined with river sketches, which I then processed in ArcGis Pro to the final map. But this method only worked for a narrow stream (2-3 m) because the camera was able to take a stream across its entire width. Now I map a much larger stream (12m) and mapping by photo is much harder and inaccurate here.
How do you map streams and rivers? Which methods do you use for that? Do you have any proven tips?
Thanks for any answers.
Have a nice day.
Please tell me about factors , characteristic and parameters that I can use in Geomorphological coceptual modeling for bridges.
Post Doctoral research is increasingly in demand as it attracts more knowledgeable and competent scholars either who are left unemployed or aspirant of farther research. Therefore, there's tough competition among them. In such condition, one has to rightly highlight his talent, skills and best research works to be succeeded in the competition. Please forward your ideas and views here. Thanks in advance!
I need your help in finding literature on the evolution of a river bar in the tide-dominated delta. Also, I want to know about the methodology which I can follow to know about the evolution/formation of a river bar.
Thanks in advance
My current project is to assess the hydrological, geological and geometric characteristics of Tigris River reach within the city of Tikrit-Iraq, to qualify this reach for tourist attractions, river transport and flood prevention.
If there are similar studies, please provide me copies of these.
I am thinking to install a microseismic monitoring system in Uttrakhand Himalayan region.The rock mainly consists of slate and rock is layered too but stress level is low.Will Microseismic monitoring system work in such geological area having low stress and poverburden thickness is of 14m at an elevation of about 1000m?
Drainage basin characteristics are very important for occurrence and intensity of gully erosion. Size of the basin is influencing the surface runoff, whereas larger basins can produce increased runoff in regard to smaller ones. Since basin shape directly impacts the size of peak discharge and its arrival time at the basin outlet I would like to know which basin shape is optimal for gully erosion occurrence, and why ?
I'm working on a project to improve predictability of the migration of silica in iron ore process. I will design a model to improve this predictability.
given that the maximum depth of water is 77 m and the lake area around 18 ha. The bed rock is sandstone rock. The average rainfall over the catchment is about 250 mm/year during winter months only.
In a braided loop, if B1 is the width of the right channel, B2 is the width of left channel and W is the width of braided bar. Suppose during the flood season, the braided bar is submerged then Can I take aspect ratio as B1+W+B2/(average depth)?
Please do suggest me reference too.
I am trying to estimate discharge for ungauged river basin and I have two or three measured discharge data and daily suspended sediment concentration of the river for past six months.
in order to calculate the areal efficiency exist some graphical methods that usually correlate mobility ratio and water cut depending on the pattern in waterflooding. However, I haven't found a plot for an inverse 5 spot pattern, would it be correct to use the same plot as for a normal 5 spot pattern?
Any additional information related to the methods for computing areal efficiency are very welcome. Thank you in advance!
I currently read studies about hydraulic River Geometry. In the context of Erosion Rates in Alluval Channels, the term Control Point was mentioned.
The wording is, "...alluvial channels may erode their beds through time if their downstream control point lowers."
Does it have to do something with the base level?
we need to design a pipe which will carry the storm coming from all three watersheds ,
suppose this situation ,
if time of concentration associated to the last watershed ( closest to the pipe ) is the greatest of three ,
should we still consider and add the time of travel for storms of other two watersheds in calculation of peak discharge for pipe 3 ??
Hi, I am working on bridge-scour phenomena under different hydraulic conditions. The main goal is to propose a practical way for estimating the temporal-evolution of local-scour depth under complex scenarios. Is there anyone interested in share pier-scour data? (steady, quasi-steady, unsteady or natural data will be much appreciated).
I am looking for riverbed depth profiles of the downstream tract of major rivers. I am interested in the last few 100s km from the coast where river process interact with marine processes and backwater effects.
I have already found data for the Mekong, Mississippi and Yangtze rivers. Could you recommend where I can find data for other rivers?
Questionnaire is carried out in order to develop my master thesis: The impact of user-defined parameters on DEM accuracy. By using feedbacks from the users who works with DEMs the conclusion about users perception of the importance of user-defined parameters in digital terrain modelling will be performed.
Thanks in advance to all !
I am studying the fluvial geomorphologic evolution of river basins impacted by glacial isostatic rebound, and would like to collaborate with interested international parties (preferably at the M.S. level or above). Currently, I am drafting a proposal for international recognition that could result in the onset of a multidisciplinary project studying fluvial geomorphology in formerly glaciated basins. Must have interest in attempting to secure INQUA recognition. Contact me for more information. Thank you.
Western margin of India is rifting actively since the detachment from Seychelles. Is there any quantitave account of the component of recent active rifting process? This includes the direction and amount of rifting.
From sub-pixel correlation of optical imagery the migration of sand dunes in river bed can be analyzed. How does this analysis enable me to suggest a suitable site for the construction of a bridge?
I would like to discuss with anyone who has studied and surveyed water mills and their interactions with the river beds, or I would have some suggestions of publications to read or download from the network. It would also be nice to be able to exchange research experiences gained in the different countries of origin. Thank you.
I intend to leave turbidity sensors over the winter in proglacial stream to be able to capture whole ablation season, however I encountered the problem that all sensors I have seen have minimum operating temperature as high as 0°C (I need around -30°C), or at least manuals say so. Do you have any experience with that? Thank You!
I want to measure bank geometry change in submerse zone during fluvial erosion at the bank toe but I cannot use distance sensor (laser eye)
because clear water in the initial stage changes to turbidity water during fluvial erosion.
Moreover, I planed to use ultrasonic sensor to measure bank geometry but the measurement instruments need to be installed outside the flume.
In this case it means the the acoustic cannot pass plexiglass for measured bank geometry changes.
I'm seeking some guidance as I develop my PhD dissertation. I had planned on using a geomorphological mapping approach (remote sensing, terrain modeling, and field mapping) to map landforms and processes operating at different spatial scales to understand the spatial distribution (pattern) and interaction of landforms at different stages of placer development (placer diamonds). I'm interested in addressing this issue from the watershed scale since much work has been done at the reach scale with the physics-based approach. I need to narrow down my focus and address specific scientific questions and am seeking advice.
I'm studying a stratigraphic section where clastic sediments are up to 400 meters thick. I have recognized three depositional environments being alluvial fan, fluvial, and marine. In the upper parts of the stratigraphic column where fluvial system turns into marine I was wondering if I've missed to record delta where these two systems intersect. The lithology in the upper part consists of an alternation of large cross-bedded conglomerate and sandy bioclastic limestone which clearly shows the sea-level fluctuation for a fair amount of time before marine conditions dominated. Did I miss recording Deltaic environments or fluvial deposits were transported to the sea with some sort of channels?
attached photos may be helpful.
Thanks for the comments in advance.
Key words: Flash flood - Gully and Rill -Land Use - Vegetation covers - Topography.
How can i combine all in one model? And how can i quantify these factors?
Suspended sediment loads are basis for various fluvial dynamics. Suspended sediment sampling is so important to develop linkages for fluviogeomorphic processes in particular and earth surface processes in general. But, for a researcher the real challenge is to adopt the right sampling methods for a complex drainage system with multiple thread channel along with its various tributaries.
Thank you very much for scholarly discussion on this particular issue! Please!!
I would like to get age constraints on the deposition of fluvial sediments in a river deposit in the Kenya Rift. Age estimates are Mid to Late Pleistocene. The sources are mostly basaltic, trachytic and phonolitic lava flows. Quarz content is fairly low, so I'm guessing OSL won't be the method of choice. Any ideas?
I looked up Google's satellite imagery and realized that a number of units with significant different are visible in the images. I want to know how this distribution pattern have been created.
I am working on the tropical rivers of Western Ghat. I found some clear cut indication of stream capturing from river network pattern. I want to know that whether there could be any framework to do numerical experiments to confirm about the process of river capturing.
I'm a bit confused about the type locality of the oligochaet Limnodrilus hoffmeisteri. In his paper, Claperede (1862) says (in French) : "Dans le lit de la Seime près Villette , canton de Genève." which means something like this: "In the littoral of the Seime near Villette, canton Genève". In present days canton Genève is in the southwestern part of lake Geneva (Lac Leman), Switserland. However the village Villette is in the Northeastern part of Lake Geneva near Lausanne, but this is in canton Vaud. There is no such river as Seime, just Rhône and l'Arve near Geneve. So I was wondering: is there a river Seime somewhere? is Seime an old name for Rhône? is Villette a village near Geneve or is Seime not a river or ? So if anybody could tell me the typelocality as written by Claparede in 1862 (see also attachment), please give me a hint.
I am preparing a spatio-temporal analysis on the lateral channel shifting of an alluvial meandering Hungarian river. I don't want to try to draw the thalweg manually because I'd prefer more precision for this purpose.
I have vectorized the river banks from aerial photographs from several time periods and I've already calculated the centerlines of the channels for each period.
Unfortunately, I have NO 3D bathymetric data.
I was trying to use the River Channel Morphology Model (link) by V. Merwade which is theoretically able to calculate thalweg based on only the sinousity and the banklines but I had many problems with using it in several ArcGIS versions as well.
Does anyone know any applicable GIS methods for determining the thalweg of a river channel?
I am trying to find out geomorphic elements that can be considered really important and require the area to be considered as a national park.
The study area is Arauca in Colombia, there is fluvial geomorphology and aeolian geomorphology.
I think may be there are some geophorms related with specific ecosystems, or groundwater.
The budget is low, so I only have some aerial photographs, and bibliography.
If someone have any ideas about literature, or methodologies I would appreciated.
Drainage basin is a place of work for fluvial geomorphologists not only as a geomorphic unit but gets attracted by many researcher also due to its interdisciplinary nature. Therefore, the delineation and mapping of it is the foremost work of further researches. The shortfall of narratives on methodology to delineate and mapping a drainage basin/catchment preludes the scientific society to make a common consensus or standardisation of this vital task of map making in broader perspectives. Please put forward your views & comments...
In Multi points facies modeling, is it possible to consider Sand as reservoir body and shale as channels in real fluvial systems.
If I consider the body as shale and channels as sand, I will lose the most reservoir property that I know it is 90% sand from the geological literature?
How it is determined the exact spot of the birth of a river? Often there is a tendency to regard as the birth of a river to remote sources of its mouth, especially when in high places. But, are considered hydrological criteria? And anthropic?
Many thanks ahead of any help.
I am planning to write an article on the topic "Comminution age technique and its application in the sediment records to reconstruct the fluvial activity in response to climate variability". Since I am unable to access the required materials online, I need favor on this. Can any one elaborate something on this?
What should be the minimum/ideal reach length for SI calculation of any sample basin? Rosgen (1996) suggested taking 20 to 40 time of bankfull width of the study reach; this may be too short to examine planform characteristics such as sinuosity.
We can find the huge variation between reach scales SI as suggested by Rosgen and long reach scale SI calculation.
Then, what should be followed for better result?
Is it possible for x to be too small (stream cross-sections too close together) when applying a kinematic routing model?
The readily available DEM such as Bhuvan DEM, ASTER DEM have been used for different purposes. But,I haven't got any literature where the detail methodology of bank angle measurement from DEM is given. I need to calculate river bank angles at different reaches of river.If some one helps me out I will be very grateful. Thank you!
Reg soil evolve due to accumulation of fine sediment on alluvial surfaces.
I indicated the horizons in the following Reg soil. Are they true?
Most of the known successions interpreted as tide-dominated deltas (e.g. Lajas, Tilje Fms.) have recently been reclassified as fluvial-dominated, tide-influenced because of the recognition of typical fluvial-derived features, such as forward-accreting, coarsening-upward mouth-bar deposits, crevasse-mouth-bar deposits, signs of seasonal variations of the fluvial discharge, etc.
Following this trend, it is arguable that the sand-rich successions that are commonly interpreted as tide-dominated deltas might be more fluvial that what was originally thought and that ancient tide-dominated delta successions have not been described yet. Does anybody know ancient deltaic successions that are convincingly and extensively tide-dominated? Why?
Thanks in advance to anyone that will contribute to this discussion.
I need to draw some diagrams to show horizontal and vertical distribution of flow velocity. I will be grateful if some one suggests for it! Thank you!!
I want to know the approximate age of any gully, i.e. the initial time of its formation. Likewise, as if I want to calculate the beginning of the erosion of any area.
Thank you in advance.
I want to describe the process of accumulation of organic material in oxbow environments (cut off meander channels).
Which term is the correct one?
The absorption and scattering properties I am referring to are the inherent optical properties (i.e. absorption and scattering coefficients). My research involves sediment transport and re-suspension of sediments in the Mississippi Sound and its effects on the optical properties within the water column. Thanks in advance for your responses.
Lateral migration of meanders in arid climate is a potential threat to bridge scour. In a preliminary assessment of channel stability in a humid subtropical climate, it is possible to consider meandering alluvial rivers less dangerous to the bridges structures.
I'm interested in studying river flows related to rainfall-runoff events. The river channel that I'm focused on has straight flow types at upstream and braided types at downstream. I place 2 water level gauges, 1 is at the boundary of straight flow type before it braided and 1 is at the braided reach downstream. I do this in order to try to build a flow routing in the river reach between station gauge 1 and 2. Is this treatment possible? Or can anyone give suggestions as to how to develop a hydraulic model for this condition?
I am looking for river course data (must be GIS vector) in the world. This kind of data could be generated from global dem such as srtm3, but, in terms of global data, it is quite difficult for individual to prepare it.
I am currently pursuing my PhD studies in streambank erosion monitoring studies. However, this kind of study is still lacking in Malaysia. There's no devices installed by our authority to monitor streambank erosion especially with heavy storms in Malaysia. I am currently using conventional erosion pins to monitor streambank erosion. I would like to compare the manual method with PEEP sensors as it is more accurate and provide automated instruments for continuous bank erosion measurement.
I am trying to develop a simple (preferably 1-D) model of particle deposition in turbulent open channel flow,
from a continuous point source / plane. The aim is to predict the transport distance until deposition occurrs.
Important assumptions are that the channel bed is uniform, rough and fully absorbing in terms of suspended particles,
that there is no re-entrainment of deposited particles, and that suspended particle concentrations are small enough to not alter
bed topology and flow characteristics.
So far I have only been able to find models that consider (re-)entrainment of particles from the channel bed, include bed load transport
or incorporate the morphological changes over time.
Would it be more sensible to start altering equations of unsuitable models to my needs, or to continue looking for apt literature?
For the latter, could you be as kind as to point out some relevant literature (e.g. developed models, conceptual/discretized equations)?
Thanks in advance.
I work in Svalbard. Proglacial rivers are shallow (usually up to ca. 50 cm), the expected discharge may reach up to 5 m3/second during extreme conditions, with summer averages of 0.5-1 m3/second. The flow is rather turbulent, sediment transfer is high, including rocks up to 10 cm in diameter. No stable ground is to be found at the sites, only gravel, occasionally washed out during higher water levels. Any additional abilities of such equipment (e.g. autosampling etc.) would be great, but I guess I'm asking too much.
If you have not heard of anything suitable for my needs, maybe you have some ideas how to organize manual discharge measurements so they will not become pain in the back very soon? I need to measure discharge in 3-4 streams, at least every 5-10 days, together 15 km of trekking. Again - what kind of equipment can you recommend?
I would appreciate any tips from more experienced colleagues.
Thanks for your time,
For example, consider if a ball falls down the inclined plane, is there a law to prove that the ball goes straight pathways and not another?