GBEHM+Snow

Based on GBEHM, a snow module with physical processes is coupled

GHEHMSnowphysical processes
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contributed at 2020-05-25

Authorship

Affiliation:  
Northwest Institute of Eco-Environment and Resources, CAS
Email:  
lihongyi@lzb.ac.cn
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Classification(s)

Earth System SubjectEarth Surface SystemHydrosphere

Detailed Description

A physically based snow module is developed to simulate the snow accumulation, melt and runo generation processes. This module is coupled with a distributed geomorphology- based eco-hydrological model (GBEHM) In the GBEHM, the basin is divided into dierent sub-basins that contain discrete ow intervals. Each ow interval is connected by several topographically similar ’hillslope-valley’ grids. Each grid has dierent land types, such as vegetation, snowpack, glacier, soil and aquifer. The runo from each grid includes surface ow, lateral ow and ground ow. In the GBEHM, the grid runo is rst transferred into the ow interval and then into the river channel from dierent pathways. The most important improvement of our module is that the snowmelt paths are separately traced in each calculation step, which make the evaluation of snowmelt contribution more reasonable. Another improvement is that the physically based snowmelt module is coupled with a geomorphology-based hy-drological model, which extends the simulation capacity of snowmelt at basin-scale hy-drological processes. In terms of the snow module at vertical dimension, the physical schemes including heat and water balance are similar with SNTHERM model[Jordan,1991], SNOWPACK model[BarteltandLehning, 2002] and CROCUS model[Vionnetetal., 2012].

In the original GBEHM model, it is dicult to distinguish the snowmelt compo- nent from total water component, because liquid water from dierent sources is mixed and transferred in simulating these hydrological processes. Here, we introduce a detailed separation method to determine the snowmelt contribution and pathway in the runo gen- eration processes (Figure 1). The proportion of snowmelt water in soil layers, aquifers and dierent types of ow are updated after the calculation of soil moisture movement and evapotranspiration. In the new separation method, the snowmelt water proportions in snowpack, in each soil layers and in each aquifer are iteratively calculated, and the contri- bution of snowmelt to total discharge is calculated.

References

How to cite

Hongyi Li (2020). GBEHM+Snow, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/885a29c5-6d23-442b-bce5-58f8e81cbc62
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Contributor

contributed at 2020-05-25

Authorship

Affiliation:  
Northwest Institute of Eco-Environment and Resources, CAS
Email:  
lihongyi@lzb.ac.cn
Is authorship not correct? Feed back

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