Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080172 |
Channel Profile and Plan-View Controls on the Aspect Ratio of River basins | |
Shelef, Eitan | |
2018-11-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:21页码:11712-11721 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The ratio between the width and length (i.e., aspect ratio) of river basins is a fundamental attribute of Earth's surface. Topographic analyses showed that the aspect ratio of high-order basins along linear mountain fronts is surprisingly consistent despite different tectonic, lithologic, and climatic conditions. Additionally, analysis of simulated landscapes showed that the aspect ratio depends on the concavity of the river profile. These observations remain difficult to explain because of the intricate shape of river networks. Here I present a simple geometric model that computes the aspect ratio from the location of a triple divide junction with neighboring basins, the concavity of the river profile, and the exponent that relates river length and drainage area (i.e., Hack's exponent). The model suggests that these seemingly independent empirical observations are interdependent and that small basins that bound larger ones play a key role in determining the aspect ratio of the larger basins. Plain Language Summary Despite the intricate geometry of river networks, their basins are characterized by a surprising regularity in the ratio between their width and length (i.e., aspect ratio). This regularity captures the pattern of landscape partitioning into river basins and hence the partitioning of water and life across Earth's surface. The causes for this regularity, however, remain unclear. This study presents a model that explains this regularity through the geometric configuration of adjacent river basins, as well as the geometry of the river profile. The agreement between model predictions and observations from natural and simulated landscapes suggests that small basins that bound larger ones play a key role in determining the aspect ratio of the larger basins and that the properties of the river profile (and hence of the erosive processes that carve this profile) are inherently linked to the aspect ratio of the river's basin. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451832600023 |
WOS关键词 | DRAINAGE ; EROSION ; SLOPE ; MODEL ; TOPOGRAPHY ; EVOLUTION ; INCISION ; BEDROCK |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27134 |
专题 | 气候变化 |
作者单位 | Univ Pittsburgh, Dept Geol & Environm Sci, Pittsburgh, PA 15260 USA |
推荐引用方式 GB/T 7714 | Shelef, Eitan. Channel Profile and Plan-View Controls on the Aspect Ratio of River basins[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(21):11712-11721. |
APA | Shelef, Eitan.(2018).Channel Profile and Plan-View Controls on the Aspect Ratio of River basins.GEOPHYSICAL RESEARCH LETTERS,45(21),11712-11721. |
MLA | Shelef, Eitan."Channel Profile and Plan-View Controls on the Aspect Ratio of River basins".GEOPHYSICAL RESEARCH LETTERS 45.21(2018):11712-11721. |
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