Distributed Hydrology-Hydraulic Coupling Model Development And Application

In the past few years,with the intensification of climate change,extreme weather has occurred frequently,and subsequently intensified the occurrence of floods.Drought and water shortage is one of the important factors limiting the sustained rapid and healthy development of our national economy.Accurate simulation of the evolution of basin floods is a practical reference for flood control and scheduling.Since factors such as rainfall and river confluence affect hydraulic movement,it is necessary to establish a mathematical model based on the complex watershed system under.Traditional flow prediction models require interval runoff observation data in the modeling process,and the lack of such data limits the development of model accuracy.Therefore,it is important to use the existing hydro-meteorological data to build a new mathematical model of rainfall-flow production in the basin.In this research work,the Fuxian Lake basin is selected as the experimental object to construct a coupled model of a hydrological model and a hydraulic model through external coupling.The simulation results of this model can provide technical support for the flood control department to develop a scientific and reasonable flood forecasting plan.The main research contents and results of this paper are as follows:1.Analyze the structure and principle of the model selected in this paper,construct the model and database through program development combined with GIS software,determine the model parameters and sub-basin division,and realize the development and construction of the distributed hydrological-hydraulic coupled model.2.Select the small watersheds in the study area as the model calibration area,construct the model,determine the parameter optimization methods and evaluation indexes,and determine the optimal set of parameters for the model in the study area through parameter rate determination and validation analysis.3.Apply the coupled model to the Fuxian Lake watershed project in Yunnan Province,calculate the runoff simulation flow data of the watershed,analyze the rainfall-runoff characteristics and design the interception scheme of the storage belt,to provide a scientific reference basis for flood control projects.In the above research work,a large number of programs based on Python were developed to solve the practical problems encountered in the project work,and the functional implementation of the program also provided a lot of reference values for later workers.