• 论文 •

### 基于地形特征的流域水文相似性

1. 1. 河海大学水资源环境学院, 南京 210098;
2. 徐州师范大学城市与环境学系, 徐州 221009
• 收稿日期:2003-03-20 修回日期:2003-09-15 出版日期:2003-12-15 发布日期:2003-12-15
• 作者简介:孔凡哲(1964-),男,江苏徐州人,副教授,在读博士,从事水文学及水资源教学与研究。
• 基金资助:

国家自然科学基金资助重大项目(50099620)

### Hydrological similarity of catchments based on topography

KONG Fan zhe1,2, RUI Xiao fang1

1. 1. College of Water Resources and Environment, Hohai University, Nanjing 210098, China;
2. Department of Urban and Environmental Science, Xuzhou Normal University, Xuzhou 221009, China
• Received:2003-03-20 Revised:2003-09-15 Online:2003-12-15 Published:2003-12-15

Abstract:

The topographic index ln( a /tan β ) is an important parameter of many physically based hydrological models In terms of a DEM, a is the cumulative upslope area draining through per contour length to a pixel, which reflects the tendency of water to accumulate at any point in the catchment, tanβ is the local slope angle of the cell, which reflects the tendency for gravitational forces to move that water downslide Catchment topography generally have a major control overflow pathways for surface flow processes and an important effect on parttern of likely water accumulation in the catchment The catchment's topography may be summarised by the distribution of the index values The topographic index may be used as an index of hydrological simularity All points with the same value of the index are assumed to respond in a hydrologically similar way Frequency distribution of the index is used in TOPMODEL for simulating hydrographs It may be expected that the catchments with the same frequency distribution of the topographic index have hydrological similarity A simple algorithm for the calculation of topographic index ln( a /tan β ) is used, In the algorithm, a and tan β of each cell is extracted separately ,and the cells, whose slope is zero, are treated specially so that ln( a /tan β ) can be calculated The frequency distribution of the topographic index ln( a /tan β ) is obtained It can be found that Xiangxihe catchment and Yanduhe catchment have hydrological similarity The frequency distribution of the index and estimated TOPMODEL parameters of Xiangxihe catchment are used to simulate the hydrographs of Yanduhe catchment and good results are obtained

PACS:

• P342