赣北红壤区坡面水系工程截流拦沙控污效应分析

Analysis on effects of sediment retention and pollution control by slope water works in red soil area in north Jiangxi Province

坡面水系工程能有效解决山丘区水土流失与面源污染问题。针对赣北第四纪红壤区气候、地形、土地利用条件以及坡面水土流失特点,选取典型坡面构建坡面水系工程,通过对两场不同降雨条件下径流、泥沙及养分的观测、取样和室内分析,研究了坡面水系工程截流拦沙控污效应。结果表明,经过坡面水系工程改造的坡面截流效应明显,可延长径流时间、控制泥沙流失、防治面源污染,其中降雨雨型对坡面水系工程上述效应的发挥有重要影响。研究结果可为江西水土流失重点治理和水土保持规划编制提供技术支撑。

The slope water works is an effective measure to control the soil and water loss and non - point source pollution in hilly and mountainous areas. On the basis of climate, topography, land use conditions, as well as the characteristics of soil and water loss in quaternary red soil area in north Jiangxi Province, with atypicaI slope equipped with slope water works, the data of runoff, sediment and nutrient under two different rainfall conditions are observed and sampled. So, the effects of sediment reten- tion and pollution control are studied. The results show that the effect of water closure is obvious after the harnessing project of the slooe, which can extend the flow confluence time. control sediment loss. and prevent non -point source pollution.