Simulating the impact of watershed management for surface water quality protection: A case study on reducing inorganic nitrogen load at a watershed scale
Simulating the impact of watershed management for surface water quality protection: A case study on reducing inorganic nitrogen load at a watershed scale
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DOI：
10.1016/j.ecoleng.2013.10.023
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发表时间：
2014
影响因子：
3.8
通讯作者：
Yi Chen;Jiabing Shuai;Zhao Zhang;P. Shi;F. Tao
中科院分区：
文献类型：
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作者：
Yi Chen;Jiabing Shuai;Zhao Zhang;P. Shi;F. Tao
非点源污染物（NPSP）的管理和控制日益受到全世界的关注。控制 NPSP 对于实现改善地表水质量的目标至关重要。本研究利用水土评估工具（SWAT）模型比较了湘江主要支流之一郑水河不同流域管理措施对沉积物和养分（铵态氮和硝态氮）输送的影响。我们的结果证实，农业区是流域营养物和沉积物的主要来源，滤带可以通过拦截和吸收营养物来显着减轻地表水污染。我们假设了五个改善水质的管理计划，以达到国家第十二个五年计划（NTFYP）设定的标准。这些计划根据其效果、经济成本效率和社会影响进行评估。结果表明，所有五个规划均能成功实现NTFYP减少流域出口污染物负荷10%以上的目标；结果表明，在考虑经济和社会影响时，以关键源区（CSA）为重点的计划并未显示出先前研究理论上所表明的优越性。同时，考虑经济因素和成本效益的计划将更加可行和合适，因为其成本效率分别比NO3−和NH4+的CSA计划高10%和30%，而且其社会影响远低于其他计划。此外，回归分析进一步揭示了流域控制无机氮处理效率的主要特征。我们的研究凸显了理论与实际相结合的意义，有助于选择和实施更有效、更合理的水质改善措施。
The management and control of non-point source pollutants (NPSPs) has been an increasing concern throughout the world. Controlling NPSP is critical to achieve the goals for improving surface water quality. This study used the Soil and Water Assessment Tool (SWAT) model to compare the effects of different kinds of watershed management measures on the transport of sediments and nutrients (ammonium nitrogen and nitrate nitrogen) in one of the main tributaries of the Xiangjiang River, the Zhengshui River. Our results confirmed that agricultural areas were the dominant sources of nutrients and sediment in the watershed and that a filter strip can significantly mitigate surface water pollution by intercepting and absorbing nutrients. We hypothesized five management plans to improve water quality for achieving the standard set by the National Twelfth Five-Year Plan (NTFYP). These plans were assessed according to their effects, economic cost efficiency and social impacts. The results showed that all five plans can successfully meet the goal of the NTFYP to reduce pollutant loads at the outlet of the watershed by more than 10%; and the results showed that plan that focused on critical source areas (CSAs) did not show its superiority as previous studies had theoretically suggested when the economic and social impacts were considered. Meanwhile, plans which considered economic factors and cost effectiveness would be more feasible and suitable as their cost efficiency were 10% and 30% higher than that of CSA plans for NO3−and NH4+, respectively, and their social impacts were much lower than other plans. Moreover, regression analysis further revealed the main characteristics of subbasin controlling the treatments efficiency of the inorganic nitrogen. Our study highlights the significance of combining theory with actual practice and would facilitate the selection and implement of more effective and reasonable measures to improve water quality.