how reservoir regulation modifies the water cycle? · 5/5/2020 · 2 regional climate and...
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KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association www.imk-ifu.kit.edu
1. Karlsruhe Institute of Technology, Garmisch-Partenkirchen Germany2. Hohai University, Nanjing, China
J. Wei1 ([email protected]), N. Dong2, J. Arnault1, B. Fersch1, S. Wagner1, Z. Zhang1, P. Laux1, C. Yang2, Q. Yang2, Z. Yu2, and H. Kunstmann1
How reservoir regulation modifies the water cycle?Incorporation of a reservoir regulation network module into a fully coupled hydrological-atmospheric model
2020.05.05
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
2 Regional Climate and Hydrology
Water Cycle & Human Activities
§ The regional water cycle is altered by human activities.
§ Reservoir regulation is a way to spatially and temporally allocate water resources in a basin for multi-purposes.
PET
Atmospheric branch
Terrestrial branch
2020.05.05
@NOAA
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
[email protected] Regional Climate and Hydrology
Reservoir Regulationstreamflow, seepage,
evaporation+
reservoir/channel area update
reservoir/channel evaporation
§ Represent reservoir regulation in a fully-coupled atmospheric-hydrolocialmodeling system WRF-HMS.
§ Assess the modification of the water cycle due to reservoir regulation
Representing Reservoirs in HMS (WRF-HMS)
2020.05.05
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
[email protected] Regional Climate and Hydrology
Water balance equation for reservoir + Regulation scheme (dry+wet) :
Vt-1
− S
+ At�P− At�E+ Qin
− Qout
Vt =
Interactions of reservoir with the water cycle@land surface
affect streamflow rounting via 2D diffusion wave equation (Qout)interact with the atmosphere via evaporation of reservoir+channel (E)
@subsurfacealter groundwater depth via seepage from reservoirs (S)
Representing Reservoirs in HMS (WRF-HMS)
2020.05.05
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
[email protected] Regional Climate and Hydrology
• 24 large reservoirs (>108 m3, black)• 201 medium reservoirs (107~108 m3, yellow)• 1037 small reservoirs (<107 m3, white)
Reservoirs in HMS (in preparison)Multi-year average (1979-1986)
• Improving streamflow simualtion• Regulating streamflow, elevating
groundwater level, moistening soil,• enhancing ET
Location of reservoirs
2020.05.05
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
[email protected] Regional Climate and Hydrology
Reservoirs in WRF-HMS (preliminary results)
§ WRF-HMS vs. WRF-HMS-RES for 2-day test run (1979 JAN 01-02)
Moister atmosphere within the plantary boundary layerdue to evaporation of reservoir & channel
Profile of basin-averaged water vaporWRF-HMS Reservoir-induced Rel. Diff.
2020.05.05
Institute of Meteorology and Climate Research (IMK-IFU) Karlsruhe Institute of Technology
[email protected] Regional Climate and Hydrology
References
§ WRF-HMS
§ Reservoir Regulation
2020.05.05