Distributed hydrological models have played a vital role in the construction of the"forecast,early warning,rehearsal,contingency plan"proposed by the Ministry of Water Resources.However,technique for dis-tributed hydrological simulation in regions lack of observed runoff data or ungauged basins needs further improve-ment.We improve the classical distributed hydrological model in three aspects including theory of watershed runoff generation and flow concentration coupling water-heat cycling,model construction & solution,and model parame-ter calibration.We propose watershed runoff generation and flow concentration theory by coupling heat balance process,and then reveal the coupling mechanization of the water and heat dynamic processes and quantitative rela-tionship of hydrothermal cycle fluxes.A systematic and complete physically-based distributed hydrological model considering water-heat balance and its numerical solution method are constructed.The model implements the capa-bility of simulating land surface temperature and water level in a distributed manner.The proposed model makes the physical meaning of the model structure and model parameters clear,and the number of parameters needing cali-bration is reduced.Instead of using discharge,we adopt land surface temperature and water level as new objectives to calibrate the model parameters based on remotely-sensed and site-observed data.The developed model was ap-plied in the Ganjiang River basin in Jiangxi Province,and the application results show that the model has a strong physical mechanism,high precision and good stability in numerical solution methods,and can carry out parameter calibration and hydrological simulation in ungauged basin.The model provides a novel idea for distributed hydrolog-ical model development and application in ungauged basins.
关键词
水文模拟/分布式水文模型/水热平衡/数值方法/定量遥感/无资料区
Key words
hydrological simulation/distributed hydrological model/water-heat balance/numerical method/quantitative remote sensing/ungauged region
维普
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