摘要 利用输出系数法核算赣江流域上游龙南市稀土矿区氮的非点源污染负荷,并建立水质分析模型(WASP),对流域内的水体进行水质氮污染模拟。结果显示:(1)模型平均相对误差低于30%,符合《水文情报预报规范》(GB/T 22482—2008)要求。(2)对不确定性较大的非点源污染负荷进行不确定性分析,耕地污染程度提高10%对氨氮和总氮的变化率影响程度最大。(3)氨氮浓度达到Ⅲ类及以上(参考《地表水环境质量标准》(GB 3838—2002),下同)的水域长度占比为53%,总氮浓度达到Ⅲ类及以上的水域长度占比达到75%。总体而言,渥江和濂江的氮污染比较严重,桃江和太平江的氮污染程度相对较轻。建议加强对农民的科学施肥指导,完善稀土开采的监管政策,提高人们的环保意识。 The nitrogen non-point source pollution load of a rare earth mining area in the upper reaches of Ganjiang River basin in Longnan,was calculated by using the output coefficient method.The WASP was constructed to simulate the nitrogen pollution.Results showed that:(1)the mean relative error of the WASP was lower than 30%,meeting the requirement of“Standard for hydrological information and hydrological forecasting”(GB/T 22482-2008).(2)Uncertainty analysis for high uncertainty factors of non-point source pollution load showed promoting pollution level of cultivated land by 10%had the highest effect on ammonia nitrogen and total nitrogen variation.(3)River length with ammonia nitrogen concentration of GradeⅢand above(according to“Environmental quality standards for surface water”(GB 3838-2002),the same below)accounted for 53%,and that with total nitrogen concentration of GradeⅢand above accounted for 75%.In total,Wojiang River and Lianjiang River had relatively severe nitrogen pollution,and Taojiang River and Taipingjiang River relatively less severe.It was suggested that scientific fertilization guidance for farmers should be strengthened,supervising countermeasures for rare earth mining should be improved,and people’s environmental protection awareness should be enhanced.
出处 《环境污染与防治》 CAS CSCD 北大核心 2021年第4期458-463,共6页 Environmental Pollution & Control
基金 国家重点研发计划重点专项(No.2016YFC0803105) 江西省教育厅科学技术研究项目(No.GJJ150661、No.GJJ150660)。
关键词 WASP 地理信息系统 水质模拟 输出系数法 稀土矿区 氮 WASP GIS water quality simulation output coefficient method rare earth mining area nitrogen
