Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027098 |
Anthropogenic and biophysical controls on low flow hydrology in the southeastern U.S. | |
Sarah H. Ledford; Margaret Zimmer; Denise Payan | |
2020-08-11 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | The original paradigm of urban hydrology identified links between urbanization and changes in hydrologic processes. One of the prominent relationships identified was increased impervious surface coverage decreased subsurface recharge and subsequently low flows. This does not consider watershed‐specific biophysical or anthropogenic characteristics that could increase low flows, such as direct discharge from wastewater treatment plants and indirect recharge to groundwater from leaking pipes and infiltration‐based green infrastructure. Here, in an effort to sharpen this original paradigm, we take a statistical approach to evaluate relationships between natural and human‐impacted watershed characteristics and a suite of low flow metrics that describe mean annual low flow magnitudes and inter‐annual variability in 54 watersheds over 15 years in the Piedmont physiographic region of the southeastern United States. We find that annual low flow magnitudes are most strongly correlated to biophysical watershed factors, including positive relationships with topography and precipitation, and negative relationships with poorly‐drained soils. In contrast, inter‐annual variability is positively correlated to land use characteristics, including forest, and negatively related to urbanization. Similarities in best‐fit models across long‐term average, wet, and dry years indicate a robustness of hydrologic drivers across watershed wetness conditions. Our results also showcase that while the original paradigm of urban hydrology may hold across traditional low flow metrics, such as baseflow index, extreme low flow drivers are complex and counterintuitive. Understanding these first‐order controls on baseflow magnitude and variability across an urbanization gradient is needed to conceptualize the impacts that continued, rapid urbanization will have on low flow dynamics. |
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/287824 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Sarah H. Ledford,Margaret Zimmer,Denise Payan. Anthropogenic and biophysical controls on low flow hydrology in the southeastern U.S.[J]. Water Resources Research,2020. |
APA | Sarah H. Ledford,Margaret Zimmer,&Denise Payan.(2020).Anthropogenic and biophysical controls on low flow hydrology in the southeastern U.S..Water Resources Research. |
MLA | Sarah H. Ledford,et al."Anthropogenic and biophysical controls on low flow hydrology in the southeastern U.S.".Water Resources Research (2020). |
条目包含的文件 | 条目无相关文件。 |
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