Enhancing rainwater harvesting efficiency in karst terrains: The role of road intercepted soil-epikarst lateral flow.

IF 8 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Journal of Environmental Management Pub Date : 2025-01-01 Epub Date: 2024-12-16 DOI:10.1016/j.jenvman.2024.123730
Zhiyong Fu, Peining Liang, Hamid M Behzad, Rongjie Fang, Sheng Wang, Jie Zhao, Hongsong Chen
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Abstract

In karst landscapes, where sustainable water management is increasingly challenged by drought-induced water scarcity, the adoption of road-based rainwater harvesting (RBWH) systems has emerged as a promising solution for improving water accessibility. Despite the growing implementation of such systems, the effectiveness of many RBWH projects in karst terrains remains suboptimal due to an inadequate understanding of runoff generation mechanisms associated with hilly road networks. This study focuses on quantifying the contributions of intercepted surface runoff (SR) and soil-epikarst lateral flow (SEF) from a newly exposed road-cut slope in a dolomite hillslope, with data collected across 156 rainfall events from May 2019 to May 2022. Our findings revealed that SEF, with an annual average volume of 2.065 × 106 L for the experimental karst catchment (with a projected area of 7850 m2), was the main contributor to road-cut slope flow (RCF), significantly surpassing SR, which accounted for an annual average of 0.283 × 10⁶ L. The annual runoff coefficients for SR, SEF, and RCF were quantified at 2.2%, 16.0%, and 18.2%, respectively. Both rainfall depth and antecedent soil moisture content were identified as pivotal factors influencing SEF, indicative of a saturation-excess runoff mechanism within the context of the karstic road-cut slope. Notably, the contribution of SEF to the overall runoff was approximately twice that of SR from both the upslope and road surface combined. These findings highlight the importance of incorporating the rainstorm runoff potential of road-cut slopes into the design and optimization of RBWH systems within dolomitic karst terrains. To improve water collection efficiency for various purposes in such initiatives, it is essential to consider the hydrological characteristics of the upslope terrain and the geometric properties of the soil-epikarst interface in the planning process.

提高喀斯特地形雨水收集效率:道路截流土壤-表层喀斯特侧流的作用。
在喀斯特景观中,可持续水资源管理日益受到干旱引起的水资源短缺的挑战,采用基于道路的雨水收集(RBWH)系统已成为改善水资源可及性的一种有希望的解决方案。尽管此类系统的实施越来越多,但由于对与丘陵道路网络相关的径流产生机制的了解不足,许多喀斯特地形的RBWH项目的有效性仍然不是最佳的。本研究的重点是量化白云岩山坡上新暴露的路堑边坡拦截的地表径流(SR)和土壤-表层喀斯特侧向流(SEF)的贡献,数据收集于2019年5月至2022年5月的156个降雨事件。研究结果表明,该试验集水区(预估面积7850 m2) SEF的年平均体积为2.065 × 106 L,是路堑坡流(RCF)的主要贡献者,显著超过SR的年平均0.283 × 10 26 L, SR、SEF和RCF的年径流系数分别为2.2%、16.0%和18.2%。降雨深度和前期土壤含水量都是影响SEF的关键因素,表明喀斯特路堑边坡中存在饱和-过量径流机制。值得注意的是,SEF对总径流的贡献大约是上坡和路面SR总和的两倍。这些发现强调了将道路切割斜坡的暴雨径流潜力纳入白云质喀斯特地形中RBWH系统设计和优化的重要性。为了提高这些计划中各种目的的集水效率,在规划过程中必须考虑上坡地形的水文特征和土壤-表层喀斯特界面的几何特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Environmental Management
Journal of Environmental Management 环境科学-环境科学
CiteScore
13.70
自引率
5.70%
发文量
2477
审稿时长
84 days
期刊介绍: The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.
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