摘要
为了进一步探究分布式水文模型(DDRM)的适用性,基于渠江流域的数字高程模型(DEM),提取了研究区域的边界、河网水系,计算了研究区域的地形指数;然后采用基于DEM的DDRM模型进行流域降雨-径流过程模拟,并用确定性系数、洪峰相对误差、峰现时间误差等对DDRM模型的模拟精度进行了评价;同时,对比分析了不同DEM栅格分辨率(1 km和2 km)对模型模拟精度的影响。结果表明:基于上述2种分辨率的DDRM模型在渠江流域降雨-径流模拟中均取得了较好的模拟效果,其中基于1 km栅格的DDRM模拟精度略优于2 km栅格。DDRM模型结构简单,参数较少、物理过程明确,而且能够模拟流域土壤含水量和径流量的空间分布,可为缺资料地区水文模拟提供一种新的方法。
We extracted the digital river network from the digital elevation model(DEM) data of the Qujiang River basin, so the basin boundary was delineated, and the topographic index distribution of this region was calculated. The DEM-based Distributed Rainfall-runoff Model(DDRM) was applied to simulate the rainfall-runoff processes in the study region. The performance of the DDRM on the simulation of rainfall-runoff processes in the Qujiang river basin was evaluated by using three indices, i.e., Nash-Sutcliffe efficiency coefficient, relative errors of both flood peak discharge and flood peak time. Meanwhile, we also compared the performance of DDRM under two DEM grid resolutions(1 km and 2 km). Results show that the DDRM based on both 1 km-and 2 km-resolution DEM performs well in the simulation of rainfall-runoff in the Qujiang River basin, and the simulation accuracy based on the 1 km grid is slightly better than the 2 km grid. Because the DDRM has the simple structure, less parameters, concise description on physical process as well as the ability to simulate the spatial distribution of soil moisture and runoff amount, it can be used for hydrological simulation in ungauged basins.
作者
李帅
周曼
万民
曾凌
杜涛
袁迪
温天福
LI Shuai;ZHOU Man;WAN Min;ZENG Ling;DU Tao;YUAN Di;WEN Tianfu(China Three Gorges Corporation,Yichang 443133,China;Powerchina Chengdu Engineering Corporation Limited,Chengdu 610072,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Bureau of Hydrology,Changjiang Water Resources Commission,Wuhan 430010,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China;Jiangxi Provincial Institute of Water Sciences,Nanchang 330029,China)
出处
《人民长江》
北大核心
2019年第3期106-112,共7页
Yangtze River
基金
国家重点研发计划项目(2016YFC0402306-01)
三峡水库科学调度关键技术第二阶段研究项目(SX4053)
关键词
降雨径流模拟
DDRM模型
栅格分辨率
缺资料地区
渠江流域
rainfall-runoff simulation
DEM-based Distributed Rainfall-runoff Model(DDRM)
DEM grid resolution
ungauged basin
Qujiang River basin
