DEM栅格分辨率对TOPMODEL模拟不确定性的影响研究  

The Impact of DEM Resolution on TOPMODEL Simulation Uncertainty

作　　者：林凯荣[1] 郭生练[2] 熊立华[2] 牛存稳[3] 

机构地区：[1]中山大学地理科学与规划学院,广州510275 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [3]中国水利水电科学研究院水资源研究所,北京100044

出　　处：《自然资源学报》2010年第6期1022-1032,共11页Journal of Natural Resources

基　　金：国家自然科学基金项目(50809078;50839005);水资源与水电工程科学国家重点实验室开放基金项目(2008B043);中国水利水电科学研究院开放基金项目(IWHR02009003);中山大学青年教师培育项目

摘　　要：选择南水北调水源区所在的汉江流域的3个不同地貌类型的子流域为试验流域,采用1:5万比例尺DEM为基准数据,基于以地形为基础的半分布式流域水文模型TOPMODEL,研究栅格分辨率对水文模拟不确定性的影响,并利用多目标模糊优化算法,对水文模拟的不确定性进行了综合评价。结果表明,DEM栅格分辨率对地形特征和地形指数都有很大的影响,从而影响水文模拟的不确定性,但由于水文模拟的复杂性在一定程度上掩盖了不同DEM分辨率计算的地形指数的差别,使得这种影响不是很大。对于现有试验流域而言,当分辨率为200 m的时候可以得到相对较优的不确定性预测区间。The hydrological uncertainty is one of the most important aspects in hydrological science research. This paper focuses on how resolution impacts the hydrological uncertainty using the TOPMODEL model based on the topographic index, which extracts from DEMs of different resolutions in the Hanjiang River. Three geomorphologic areas are selected as test areas, representing different terrain types from smooth to rough. Their DEMs are produced from digitizing contours of 1：50000 scale topographical maps. Hydrological uncertainty was assessed synthetically by using the multiple-objectives fuzzy optimal method. It is found from the analysis on different spatial resolutions that the topographic characteristics parameters of river basin are affected by DEM resolution remarkably, so as to affect the hydrological uncertainty, but this effect is not very great due to the hydrological complexity, and 200 m should be the more suitable grid size for hydrological uncertainty in this area. The integrated method of assessing hydrological uncertainty is a new throughway to study the various hydrological uncertainties.

关 键 词：水文学及水资源 DEM分辨率 TOPMODEL 

分 类 号：P333.9[天文地球—水文科学]