不同填洼结果下TOPMODEL在流域径流模拟中的应用比较研究

湿度指数是TOPMODEL的重要输入。从数字高程模型（DEM）中提取湿度指数之前需对DEM进行洼地处理。大多数填洼方法在对洼地处理后一般存在平坦区，在确定性最陡坡度法下平坦区栅格水流将很难进行流量分配，此类填洼本文称之为不完全填洼。为了使整个流域的水量在流域出口点达到平衡，本文提出了一种完全填洼方法，讨论了完全填洼和不完全填洼下集水面积、坡度、湿度指数的空间分布，比较了二种填洼结果下TOPMODEL在牧马河流域径流模拟中的应用。模拟结果表明，完全填洼和不完全填洼下TOPMODEL模拟的的径流过程区别不大。

A Comparitive Study of Simulated Runoff by TOPMODEL Using DEM Data From Two Different Pit-filling Results

Wetness index is an important input to Topmodel.Before extracting the wetness index from Digital Elevation Model(DEM),we have to treat pits existed in the DEM data,which is called pit-filling.For the result of most pit-filling methods,there are normally flat areas present at DEM data,which raises difficulty of distribution of flowing in flat DEM cells under the Single Direction mthod,such pit-filling methods named partly-filling in this passage.In order to balance the catchment flowing at basin outlet,a fully-filling method is posed here.In the paper,it first introduced a fully-filling method,then analysed the chara cteristics of the spatial distribution for the contributing area,slope and wetness index under the two pit-filling resuts,at last,comparedthe simulated runoff with topmodel in Mumahe river basin.And the result shows that simulated runoff in the fully-filling is almost the same as in the partly-filling method.