摘要
以东江流域的岳城、胜前、东坑、蓝塘和九州五个子流域为例,应用前四个子流域分析DEM分辨率和流域大小对地形指数和TOPMODEL模型模拟结果的影响,探讨TOPMODEL模型对DEM分辨率的依赖性.结果表明:DEM分辨率对地形指数有着显著的影响,且径流模拟精度依赖于DEM空间分辨率,随着DEM空间分辨率的降低模拟得到的确定性系数逐渐减小.为了克服TOPMODEL模型难以考虑降雨空间分布不均对径流过程的影响,建立基于子流域的TOPMODEL模型,将基于子流域的TOPMODEL模型和整个流域的TOPMODEL模型应用九州子流域进行模拟比较,发现基于子流域的TOPMODEL模型能够得到精度更好的模拟效果,而且可以得到不同子流域对流域出口流量过程的贡献度,进而能够分析不同降雨情况下的流域出口洪水过程.
Aimed at Yuecheng,Shengqian,Dongkeng,Lantang and Jiuzhou sub-basins in the Dongjiang watershed,the effect of the spatial resolution of DEM and basin area on the topographic index and hydrologic simulating precision of TOPMODEL model is deeply studied.The spatial resolution of DEM has some dependence on the topographic index.The simulated runoff is dependent on the spatial resolution of DEM,the Nash and Sutcliffe efficiency coefficient is reduced with the lessening of the spatial resolution of DEM.TOPMODEL model for sub-basin is developed in this paper,to overcome the difficulty of the TOPMODEL model hard to analyze the spatial non-uniform distribution of rainfall.The sub-basin TOPMODEL model is compared with the TOPMODEL model by the simulated runoff at Jiuzhou sub-basin of the Dongjiang watershed.The sub-basin TOPMODEL model may obtain the simulated runoff at a higher precision.
出处
《冰川冻土》
CSCD
北大核心
2010年第3期587-592,共6页
Journal of Glaciology and Geocryology
基金
国家自然科学基金重点项目(40830639)
国家自然科学基金项目(5087901640801012)
水文水资源与水利工程科学国家重点实验室专项(1069-50985512)资助
