Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028058 |
Precipitation Characteristics and Land Cover Control Wet Season Runoff Source and Rainfall Partitioning in Three Humid Tropical Catchments in Central Panama | |
A.L. Birch; R.F. Stallard; H.R. Barnard | |
2021-01-21 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Mechanisms of runoff generation in the humid tropics are poorly understood, particularly in the context of land use / land cover change. This study analyzed the results of 124 storm hydrographs from three humid tropical catchments of markedly different vegetation cover and land‐use history in central Panama during the 2017 wet season: actively grazed pasture, young secondary succession, and near‐mature forest. We used electrical conductivity to separate baseflow (old water) from storm‐event water (new‐water). In all three land covers, new‐water dominated storm runoff generation in 44% of the sampled storm events, indicating the dominance of fast shallow flowpaths in the landscape. Activation of these flowpaths was found to depend on a combination of maximum rainfall intensity and total storm rainfall, which, in turn, relates to markedly contrasting hydrograph separation results among land covers. Relationships between these rainfall characteristics and storm runoff generation were non‐linear, producing a threshold response with the exceedance of specific rainfall volumes and/or intensities. The pastoral catchment delivered order of magnitude more new‐water during storm events than the two forested catchments. Although new‐water contributed minimally (<10%) to total wet season runoff in the forested catchments, 43% of runoff generation in the pasture came from five large rainfall events where a threshold response produced substantial increases in total runoff and new‐runoff efficiency. Based on our results, we propose a conceptual model of hydrologic flowpaths in humid tropical systems that can explain previously observed disparities in seasonal storage and runoff with respect to land use/ land cover. 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/313805 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | A.L. Birch,R.F. Stallard,H.R. Barnard. Precipitation Characteristics and Land Cover Control Wet Season Runoff Source and Rainfall Partitioning in Three Humid Tropical Catchments in Central Panama[J]. Water Resources Research,2021. |
APA | A.L. Birch,R.F. Stallard,&H.R. Barnard.(2021).Precipitation Characteristics and Land Cover Control Wet Season Runoff Source and Rainfall Partitioning in Three Humid Tropical Catchments in Central Panama.Water Resources Research. |
MLA | A.L. Birch,et al."Precipitation Characteristics and Land Cover Control Wet Season Runoff Source and Rainfall Partitioning in Three Humid Tropical Catchments in Central Panama".Water Resources Research (2021). |
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