摘要
合理的导水率假设关系对于提高TOPMODEL模型在流域径流模拟中的精度具有重要意义。以旬河流域为例,基于中国土壤水力参数集确定了流域导水率关系,将原TOPMODEL模型的指数型导水率关系修改为抛物线型,并通过引入植被冠层覆盖参数来改进TOPMODEL降雨模块。研究结果表明,选取适用于研究流域的导水率假设关系,可有效地提高TOPMODEL模型的模拟精度。同时,对于以林草地为主要土地利用类型的流域,考虑植被冠层截留的影响可有效改善模型模拟效果。
Appropriate hydraulic conductivity assumption is of great significance for TOPMODEL to increase its accuracy in runoff modeling.Using the China dataset of soil hydraulic parameters,this study developed the TOPMODEL with power function hydraulic conductivity assumption,instead of the original exponential function assumption,in Xunhe watershed.What is more,this study also introduced the canopy cover fraction to improve the precipitation module in TOPMODEL.The results draw the conclusion that choosing the appropriate assumption of hydraulic conductivity could make TOPMODEL simulate the runoff more accurately.Besides,it also shows that especially for the watersheds of which the main land use types are forest and grass land,considering the effect of canopy cover could improve the simulation of TOPMODEL.
作者
李钰珩
熊立华
唐莉华
LI Yuheng;XIONG Lihua;TANG Lihua(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China;School of Water Resource and Hydropower Engineering,Wuhan University,Wuhan 430072,China)
出处
《水文》
CSCD
北大核心
2020年第4期33-39,共7页
Journal of China Hydrology
基金
国家自然科学基金项目(41890822)。
