为了更好地理解流域水环境机理过程,基于高效高精度水动力水质耦合模型,通过优化模型内、外边界以及耦合沉积物模块,提出了一个可用于模拟大区域复杂地形洪水演进及其伴随污染物输移转化过程的分布式河网水环境高分辨率数值模型,即基于图形处理器(graphics processing unit,GPU)加速的水动力及污染物输移数值模型(GPU accelerated surface water flow and associated transport,GAST).模型充分考虑了复杂地形河道本底特征及沉积物对污染物的吸附解吸过程,区分了不同本底特征的参数异质性;多点位时变流量和时变浓度模拟功能为多模型耦合模拟水环境过程提供了接口,并引入GPU加速并行计算.最后基于复杂地形河网的多点位监测数据对模型进行了检验.结果表明:模型运行速度快且模拟精度高,为复杂地形河网水环境更深层次机理过程研究、水环境精准溯源、水质规划和管理政策制定提供一个高效、可靠的工具.
Research on high-resolution numerical model of water environment in distributed river network
To better understand the mechanism process of water environment in a basin,a distributed river network water environment high-resolution numerical model,i.e.,graphics processing unit(GPU)accelerated surface water flow and associated transport numerical model(GAST)is proposed by optimizing the internal and external boundaries of the model and coupling the sediment modules,based on a high-efficiency and high-precision hydrodynamic and water quality coupling model.This model can be used to simulate the flood evolution of large area complex terrain river network and its accompanying pollution transport and transformation processes.The model fully considers the background characteristics of complex terrain rivers and the adsorption and desorption processes of pollutants by sediments,distinguishes the parameter heterogeneity of different background characteristics.The multi-point time-varying flow and time-varying concentration simulation functions provide interfaces for multi-model coupling simulation of water environment processes,and introduces graphics processing unit(GPU)to accelerate parallel computing.Finally,the model is tested based on the multi-point monitoring data in a complex terrain river network.The results show that the model runs fast and has high simulation accuracy,which provides an efficient and reliable tool for deeper mechanism and process researches of water environment,accurate traceability of water environment,and water quality planning and management policy formulation of river network with complex terrain.
water environment assessmentgraphics processing unit(GPU)acceleration technologyhigh efficiency and high precisioncoupling model
NETL
NSTL
万方数据
