| 均值变点及分叉比确定最佳汇流阈值的对比 |
| |
| 引用本文： | 梁倍瑜,徐亚莉,白雷超,罗明良,赵文启.均值变点及分叉比确定最佳汇流阈值的对比[J].中国农学通报,2017,33(23):76-82. |
| |
| 作者姓名： | 梁倍瑜 徐亚莉 白雷超 罗明良 赵文启 |
| |
| 作者单位： | 西华师范大学国土资源学院,西华师范大学国土资源学院,西华师范大学国土资源学院,西华师范大学国土资源学院,西华师范大学国土资源学院 |
| |
| 基金项目： | 国家自然科学基金项目“基于DEM的黄土高原流域侵蚀基准体系研究”(41101348)；西华师范大学基本科研业务费专项资金资助项目“黄 土地貌鞍部下切效应研究”(15C002)；绵阳师范学院四川省生态安全与保护重点实验室“干热河谷生态退化区冲沟侵蚀模拟的不确定性研究” (ESP1606)。 |
| |
| 摘 要： | DEM为水文分析提供了更加多样化的研究分析途径。研究以ASTER GDEM为数据源,利用均值变点和水道分叉比综合对比分析不同区域的水文特征和流域地貌特征,对比不同区域在最佳阈值提取的河网差异及彼此间流域河道分叉比的特征。试验结果表明:清溪河样区和杏子河样区的最佳汇流阈值分别为1500和1300,其所对应的河网密度分别为0.63和0.68;不同的流域内取相同的汇流阈值时河道的分叉能力相同或相近,但河道的数目上有较大的区别。这两者的结合可以在今后的地形分析中提供必要的理论依据。
|
| 关 键 词： | 河道分叉比 均值变点 DEM 阈值 杏子河样区 清溪河样区 |
| 收稿时间： | 2017/2/23 0:00:00 |
| 修稿时间： | 2017/4/18 0:00:00 |
Comparison of the Determination of Optimal Convergence Threshold Based on Mean Change-point and Bifurcation Ratio |
| |
| Abstract: | Digital Elevation Model provides more diversified techniques for the hydrological analysis. The paper makes use of mean of change-point and bifurcation ratio to synthetically analyze hydrological characteristics and geomorphic features in different area, meanwhile, compared with difference of river network extracted through the optimal threshold and characteristic of bifurcation ratio based on ASTER GDEM. The result indicates that the optimal convergence threshold of the Qingxi river and the Xingzi river are 1500 and 1300 respectively, drainage density of the Qingxi river and the Xingzi river respectively are 0.63 and 0.68; the ability of branch of river through the identical convergence threshold in different basin is the same or similar, but the number of the channel has great difference. The combination of the two factors may provide the necessary theoretical basis in the future. |
| |
| Keywords: | bifurcation ratio mean of change-point DEM threshold The Xingzi river The Qingxi river |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国农学通报》浏览原始摘要信息 |
| 点击此处可从《中国农学通报》下载免费的PDF全文 |
|
