南水北调与水利科技（中英文）2025，Vol.23Issue(2)：303-311,9.DOI:10.13476/j.cnki.nsbdqk.2025.0025
南水北调中线总干渠西黑山沉积物营养盐释放速率
Release rate of sediment nutrients in the slow flow area of the main canal of the Middle Route of South-to-North Water Transfers Project
摘要
Abstract
The Middle Route of South-to-North Water Transfers Project is a large-scale inter-basin water diversion project built in China.Since 2014,its water quality safety has attracted wide attention from all walks of life.The main canal of the Middle Route of South-to-North Water Transfers Project is a closed artificial channel,and the input of exogenous pollution is considerably less.The endogenous release of sediment is one of the important factors affecting its water quality safety.Sediments are easy to deposit in the slow-flow areas,such as the water diversion section and the backwater gate of the main canal of the Middle Route Project,also there is a great risk of sediment nutrient release. The typical slow flow area of the main canal of the Middle Route of the South-to-North Water Transfers Project,the upstream section of the Xiheishan intake sluice,was selected.The surface sediment culture method was used to explore the release rate and expose the influence of different environmental factors on the release rate. Through the indoor sediment release experiment,the following results were obtained:the sediment pollution in the upstream section of the Xiheishan intake sluice was serious.The pollution index of total nitrogen in the upstream section of the Xiheishan intake sluice was 4.68,the pollution index of total phosphorus was 0.55,and the comprehensive pollution index was 3.79.The total nitrogen and total phosphorus were in severe and mild polluted states,respectively.The release rates of total phosphorus,total nitrogen,ammonia nitrogen,nitrate nitrogen and permanganate index in the upper reaches of the Xiheishan intake sluice were 3.77,119.81,312.53,27.93 and 135.16 mg/(m2·d),respectively.The risk of sediment release is high.Temperature and pH are two key factors affecting the release rate of sediment.The higher the temperature,the greater the release rate of total phosphorus,total nitrogen,ammonia nitrogen,nitrate nitrogen and permanganate index.The release rate of total phosphorus,total nitrogen,ammonia nitrogen,nitrate nitrogen and permanganate index at 26℃ is 2.41 to 442.04 times that at 7℃.The neutral pH is not conducive to the release of sediment pollutants,while acidity or alkalinity will lead to an increase in the release rate.The release rate of total phosphorus,total nitrogen,ammonia nitrogen,nitrate nitrogen and permanganate index at pH 9 is 1.52 to 9.33 times that of pH 7.The relationship between the release rate of total phosphorus in the sediments of the upper reaches of the Xiheishan intake sluice and the temperature and pH value conforms to the quadratic curve.The relationship between the release rate of total nitrogen and temperature conforms to the exponential function,while the release rate of total nitrogen and pH value,release rate of ammonia nitrogen and temperature and pH value,the release rate of nitrate nitrogen and temperature and pH value,and the release rate of permanganate index and pH value conform to the quadratic curve. The sediment pollution in Xiheishan is serious and the release rate of sediment increases with the increase of temperature.Both acidity and alkalinity lead to the increase of sediment release rate.In summer,the temperature and pH value of overlying water in Xiheishan reach the maximum.The management department of Middle Route of South-to-North Water Transfers Project should carry out dredging work before summer to reduce the risk of sediment release.关键词
沉积物/南水北调中线工程/营养盐/环境因子/内源释放Key words
sediment/Middle Route of South-to-North Water Transfers Project/nutrient/environmental factor/endogenous release分类
建筑与水利引用本文复制引用
蔡晓彤,刘凯,刘晓波,董飞,黄爱平,白冰..南水北调中线总干渠西黑山沉积物营养盐释放速率[J].南水北调与水利科技（中英文）,2025,23(2):303-311,9.基金项目
国家重点研发计划项目(2021YFC3200903) （2021YFC3200903）
中国水利水电科学研究院基本科研项目(WE0145C032024) （WE0145C032024）
中国水利水电科学研究院基本科研项目(WE0145C072023) （WE0145C072023）
