Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028959 |
Direct observation of hillslope scale StorAge Selection functions in experimental hydrologic systems: Geomorphologic structure and preferential discharge of old water | |
Minseok Kim; Till H. M. Volkmann; Yadi Wang; Antonio A. Meira Neto; Katarena Matos; Ciaran J. Harman; Peter A. Troch | |
2022-01-10 | |
发表期刊 | Water Resources Research |
出版年 | 2022 |
英文摘要 | Spatially-integrated water transport dynamics at the hillslope scale have rarely been observed directly, and underlying physical mechanisms of those dynamics are poorly understood. We present time-variable transit time distributions (TTDs) and StorAge Selection (SAS) functions for a 28 day tracer experiment conducted at the Landscape Evolution Observatory (LEO), Biosphere 2, the University of Arizona, AZ, USA. The observed form of the SAS functions is concave, meaning that older water in the hillslope was preferentially discharged than younger water. The concavity is, in part, explained by the relative importance of advective and diffusive water dynamics and by the geomorphologic structure of the hillslopes. A simple numerical examination illustrates that, for straight plan shaped hillslopes, the saturated zone SAS function is concave when the hillslope Péclet (Pe) number is large (and thus when the advective water dynamics are more pronounced). We also investigated the effect of hillslope planform geometry on the saturated zone SAS function using a model and found that the more convergent the plan shape is, the more concave the SAS function is. A numerical examination indicates that the unsaturated zone SAS function is concave for straight and convergent hillslopes, when the soil thickness is uniform. The concavity of those subcomponent SAS functions signifies that the hillslope scale SAS function is concave for straight or convergent plan shape hillslopes when the hillslope Pe number is high. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
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/345107 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Minseok Kim,Till H. M. Volkmann,Yadi Wang,et al. Direct observation of hillslope scale StorAge Selection functions in experimental hydrologic systems: Geomorphologic structure and preferential discharge of old water[J]. Water Resources Research,2022. |
APA | Minseok Kim.,Till H. M. Volkmann.,Yadi Wang.,Antonio A. Meira Neto.,Katarena Matos.,...&Peter A. Troch.(2022).Direct observation of hillslope scale StorAge Selection functions in experimental hydrologic systems: Geomorphologic structure and preferential discharge of old water.Water Resources Research. |
MLA | Minseok Kim,et al."Direct observation of hillslope scale StorAge Selection functions in experimental hydrologic systems: Geomorphologic structure and preferential discharge of old water".Water Resources Research (2022). |
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