Identification of multilevel priority management areas for diffuse pollutants based on streamflow continuity in a water-deficient watershed
Identification of multilevel priority management areas for diffuse pollutants based on streamflow continuity in a water-deficient watershed
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基于水流连续性的缺水流域扩散污染物多级优先管理区识别
DOI：
10.1016/j.jclepro.2022.131322
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发表时间：
2022-03
影响因子：
11.1
通讯作者：
Wei Li
中科院分区：
文献类型：
--
作者：
Shujiang Pang;Xiaosheng Wang;Charles.S. Melching;Haiying Guo;Wei Li
农业弥漫性污染是全球范围内地表水水质恶化和富营养化的重要原因之一。然而，在缺水流域，确定弥漫性污染物的农业优先管理区（apma）仍然是一个持续的挑战。为了提高APMA识别的准确性，本文将由可靠性-弹性-脆弱性（R-R-V）指标构建的径流连续性指标与SWAT模型相结合，提出了一种改进的APMA识别框架。该框架在张河流域进行了测试，主要结果如下：首先，对SWAT模型进行了校准和验证，在校准期和验证期，该模型的Nash-Sutcliffe效率（NSE）和决定系数（R2）分别大于0.75和0.80。其次，湿润年是年尺度上扩散总氮和总磷输出的关键时期。具体而言，在月尺度上，TN的关键损失期为4 - 10月，尤其是7月和8月。而张河流域总磷损失的关键期主要集中在7 ~ 9月。③径流连续性指数较高的河段主要位于流域中下游。上游由于流量较少，SCI值相对较低。④考虑SCI估算，连接岳城水库的流域最终出水口TN和TP的apma近似分布在青章河小流域和卓章河小流域中下游两个区域。与改进后的APMA框架相比，未进行SCI评价的原始APMA框架对TN和TP APMA的主要面积分别高估了27.17和10.02个百分点。修订后的APMA框架可以很容易地推广到其他缺水流域，以提高农业弥漫性污染的识别和控制效果。
Agricultural diffuse pollution is, on the global scale, one of the most important causes of surface water quality deterioration and eutrophication. However, the identification of agricultural priority management areas (APMAs) for diffuse pollutants is still an ongoing challenge in water-deficient watersheds. To enhance the accuracy of identification of APMA, a modified framework for APMA identification is proposed by combining the streamflow continuity index constructed by Reliability-Resilience-Vulnerability (R-R-V) indices and the SWAT model in this paper. This novel framework was tested in Zhang River Watershed and the main results are as follows. First, the SWAT model is calibrated and validated with a good performance of the Nash-Sutcliffe efficiency (NSE) and coefficient of determination (R2)greater than 0.75 and 0.80 for both the calibration and validation periods, respectively. Second, the wet year is found to be the critical period for diffuse TN and TP output at an annual scale. Specifically, the critical loss period of TN is identified as from April to October on the monthly scale, especially in July and August. However, the critical period of TP loss is mainly concentrated in the range from July to September in Zhang River Watershed. Third, the reaches with a high streamflow continuity index(SCI) are primarily located in mid-downstream part of the watershed. The reaches are mostly characterized by relatively low SCI values due to the lack of streamflow volume in the upper reaches. Fourth, the APMAs for TN and TP for the watershed final outlet connected to the Yuecheng Reservoir are approximately distributed in two areas by considering the SCI estimation, namely the Qingzhang River sub-watershed and the mid-downstream part of the Zhuozhang River sub-watershed. Compared with the results obtained from the modified APMA framework, the main areas of TN and TP APMAs may be overestimated by 27.17 and 10.02 percentage points, respectively, using the original APMAs framework without the SCI evaluation. This revised APMA framework can be easily extended to other water-deficient watersheds for improving the efficacy of the identification and the control of agricultural diffuse pollution.
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作者：
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通讯作者：
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DOI：
10.1016/j.scitotenv.2016.11.158
发表时间：
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期刊：
The Science of the total environment
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DOI：
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发表时间：
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