| 孙爱立,余钟波,杨传国,谷黄河.我国水系提取阈值影响因素分析[J].水利学报,2013,44(8): |
| 我国水系提取阈值影响因素分析 |
| Impact factors of contribution area threshold in extracting drainage network for rivers in China |
| |
| DOI： |
| 中文关键词: 河网 阈值 DEM 影响因素 |
| 英文关键词: drainage network threshold DEM impact factors |
| 基金项目: |
|
| 摘要点击次数: 3741 |
| 全文下载次数: 548 |
| 中文摘要: |
| 阈值确定是数字高程模型（DEM）提取水系的重要环节，影响数字流域水系的拓扑关系和几何特征，进而影响流域的坡面和河道汇流过程。选取我国50个子流域作为样本，基于DEM 提取河网，确定最佳集水面积阈值，并分析主要空间影响因素；采用相关分析和多元线性回归分析等方法，分析流域降水、地形和地表覆被与河网阈值的关系。结果表明，流域雨量越充沛，地形越陡峭，植被越茂密，集水面积阈值就越小，并得出阈值与降水、坡度和地表覆被的定量关系。该方法应用于其他流域，效果较好。 |
| 英文摘要: |
| Determination of threshold plays an important role in extracting drainage network based on DEM and affects the topological and geometric characteristics of the digital river system， thereby affecting hillslope and fluvial process. In this paper，50 sub-basins were selected as the sample to extract drainage network based on DEM and to determine the best critical contribution area whose main spatial impact factors were analyzed. The relationships among precipitation，topography，land surface cover and threshold were investigated by using correlation analysis and multiple linear regression analysis. The results show that the critical contribution area decreases with the increasing precipitation， slope and the total area index （TAI），
and the quantitative equation of the threshold and precipitation，slope，and land surface cover has been established. The equation has a good behavior in other watersheds making the determination of the threshold more objective and convenient. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |