北京大学学报自然科学版 ›› 2021, Vol. 57 ›› Issue (4): 699-706.DOI: 10.13209/j.0479-8023.2021.047

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内蒙古高原东部内流河水系结构与流域特征的关系

刘丹露, 王易初†   

  1. 北京大学环境工程系, 水沙科学教育部重点实验室, 北京 100871
  • 收稿日期:2020-05-15 修回日期:2021-04-16 出版日期:2021-07-20 发布日期:2021-07-20
  • 通讯作者: 王易初, E-mail: wangyichu(at)pku.edu.cn
  • 基金资助:
    国家自然科学基金(51539001)资助

Relations between Structural Properties of Endorheic Rivers and Basin Characteristics in Eastern Inner Mongolia Plateau

LIU Danlu, WANG Yichu†   

  1. The Key Laboratory of Water and Sediment Sciences (MOE), Department of Environmental Engineering, Peking University, Beijing 100871
  • Received:2020-05-15 Revised:2021-04-16 Online:2021-07-20 Published:2021-07-20
  • Contact: WANG Yichu, E-mail: wangyichu(at)pku.edu.cn

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摘要：

基于30 m水平分辨率的数字高程模型, 提取内蒙古高原东部的内流河水系, 结合流域气候与下垫面要素, 研究水系结构与流域特征的关系。结果表明, 流域气候(降水和潜在蒸发)与水系结构关系密切, 表现为分支比、侧枝比和河网密度随降水量的增加而增大, 随潜在蒸发量的增加而减小。另一方面, 流域下垫面条件(坡度和草原覆盖率)对内流河水系结构影响较大, 表现为水系结构总体上受地形控制, 但旱生或半旱生的 地表草本植物不利于水系发育。

关键词: 内流河, 水系结构, 流域因子, 内蒙古高原

Abstract:

Based on the river networks extracted from DEM at 30 m resolution, the relations between structural characteristics of endorheic rivers and basin properties in the eastern Inner Mongolia Plateau were analyzed. The results show that rainfall and potential evaporation are both closely related to structural parameters of rivers. Basin underlying surface conditions also affect the structure of endorheic rivers. Specifically, basin slope promotes the branching of river networks, whereas arid and semi-arid grass plants suppress the development of endorheic rivers.

Key words: endorheic river, structural characteristics, basin property, Inner Mongolian Plateau

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