Questions related to Ecohydrology
The argument is often made in stemflow research that “reporting stemflow as a percentage of rainfall disconnects it from its input area" - thus, we should use the funneling or enrichment ratio. However, is this true? Does expressing stemflow as a fraction of rainfall create a "disconnect" between stemflow and its input area? I believe it does not, i.e., estimating relative stemflow across the canopy says nothing about stemflow's input area. Perhaps this is, unwittingly, a rhetorical statement, used to persuade others to report stemflow in a way that makes it look important "despite being a small fraction of rainfall"?
Of course, stemflow CAN be important hydrologically, ecologically, and biogeochemically. However, I am not sure these funneling metrics can tell us when/how stemflow is important. I'm also not sure how these metrics fit into theoretical and numerical models. So far, these thoughts have been shared through static presentations and publications. But, that really limits the conversation. So, I figured I'd ask the RG community: why do we, in the stemflow community, still report stemflow in these unitless (funneling and enrichment) ratios? In what ways do these ratios actually improve our understanding of stemflow, stemflow-environment interactions, or integrate stemflow into theory/models?
Although hydrological studies in latinoamerica are common, the interactions with the ecology and the human dimension is rarely undertaken. I would like to know if it has been performed any study related to coupled not only hydrology with the biochemical cycles, but that also had related the hydrology with the environmental awareness. Moreover, I would like to know the project features.
Range of Variability Approach, is introduced in the D. RICHTER 1997 article , "How much water does a river need?" for designing "management targets" for the eco-friendly river management.
My question, is how one can or what are the considerations to design hourly targets based on that approach and those 32 indices he introduced in his seminal 1996 article.
( Should we obtain daily or hourly streamflow records ? but the indices Richter designs targets from are monthly )
I'm new to calculating GPP/CR from diel oxygen curves, and have been getting negative GPPs and I am trying to figure out what this means. I know one large source of error is the reaeration coefficient. I understand there are lots of opinions about estimating reaeration coefficients- we cannot afford to do injection tests. So, I have been getting the coefficients by looking at the slope between DO deficit and DO change per hour at night based off our understanding of Heffernan and Cohen 2010/Owens 1974. The resulting coefficients are reasonable- 5 to 20 day-1. But, continuing the one-station calculations results in negative GPPs. I have noticed that, despite having a clear diel curve, our streams are almost consistently undersaturated in DO- would that be the reason I am getting negative GPPs? I am looking for advice on interpretation or different methods to try!
Currently, my research looking for a relationship between interception, infiltration, runoff, water uptake by the roots of plants, and groundwater. I'm trying to develop a model of water conservation. My hypothesis, interception and plant roots play an important role in the hydrological cycle.
I am doing some research in river habit modelling and I am looking to see the effect of resolution of topography description has on 2D modelling of river habitat.
If there is anyone who has knowledge in this field of modelling rivers and willing to share their information, please don't hesitate to contact me
Any help would be appreciated
How to take a deep sediment core from a very shallow and a hard to reach lake? I can't use a platform. Lake is only 3 metres deep. The area around the lake is wooded. Any methods/ideas?
I'm looking for case studies of biological observations in floodplains that could follow the Intermediate Disturbance Hypothesis. The study noted below seems to be one of the only ones, but I'm guessing there should be similar observations looking at biota.
Using LIDAR to model rainfall interception is advantageous to other interception models in many respects (e.g., Gash, Revised Gash, Rutter, and etc.). While published models on rainfall interception have shown to be highly accurate, most require many parameters and long-time measurements.
To understand regional or watershed-level eco-hydrological processes, LIDAR can provide both the spatial coverage and resolution needed to address such questions.
There are many phenology models, each of them need threshold to decide the phenology event should occur or not. The threshold often set by emprical and differs between PFTs or vegetation types. In a distribute ecohydrology model, the temperature and soil moisture and other variables vary among grids, so do these thresholds also need to vary among grids?
There are different phenology models based on different conditions or their combinations, such as temperature, VPD, soil moisture, photoperiod and so on. In a watershed, when conduct ecohydrology simulation, phenology plays an important role because it represent the vegetation dynamic. In a distribute ecohydrology model, the limiting resource is different among locatinos, does it need different phenology appoaches among different grids to discribe this difference?
I am working on a wetland, I wanna correlate water quality with phytoplankton and macrophytes present in the said water water bodies
Landscape commuity genomics is related to eco-evolutionary processes in complex environments, such as stream and riparian ecosystems. However, its framework is not clear at the moment, because we don't know how genomic variation is affected by dynamic interactions between abiotic (environmental) and biotic (community) effects..
I want to have information about the of species, plantation area, plantation age as well as hydrological effects of these species in the semiarid and area climate zones.
Surface runoff may response quickly to rainfall, evapotranspiration may be different from day to day, groundwater may change slowly, vegetation growth also changes slowly. Could I set a fixed time step value for different processes in a given region in an integrated ecohydrology model? How to do this and what do I need to limit these values?
Soil erosion is an important soil degradation process in many regions in the world. The practices performed for erosion control are multiple (soil tillage, mulching, fascine,...) but often not enough integrated in ecological engineering including the plant traits effect on reduction of erosion and runoff.
Practices performed and published study are often regional and focus on capacity of species of regional flora and little on plant traits reducing erosion and runoff.
What are the main shoot and root traits influencing erosion and runoff?
A bit of epistemology.
My current official job title is 'hydro-ecological modeller', and I am coming from hydrology. I was looking for topics on this network but could not find any 'hydroecology' topic, only 'ecohydrology'. I would be interested to know how you define this field between fields that is hydro-ecology or eco-hydrology (or are they two different fields actually). It is not such a trivial question as I often struggle with which keywords I should use when referencing papers.
Several literature discussed Ecohydrology as a multidisciplinary science but there are also some which discussed it as a transdisciplinary science and also some literature used it as an interdisciplinary science.
If we understand that overland flow is modified by surface features, such as clumps of grass, litter and rocks, can we ever scale-up to hillslope scales to understand how flows are affected by landscape structure. For example, the difference between pasture-only land use compared to pastured hillslopes with scattered trees, bands of trees, or fallen timber?
I am using stable isotopes to study source water of different forest species, and I would like to separate pools of water whith different availability. Classic soil methods (e.g. Richards Chamber) are not specially designed to recover the water at different water potentials. Other alternatives I have seen are soil equilibration with water vapour, CO2 etc. I would like to get some practical hints from anybody who has already tried some of these methods.