基于多因子分析的问津河生态风险评价研究

Ecological risk assessment of Wenjin River Based on Multi-Factor Analysis and Evaluation

依据2018年吴江问津河的现场调查数据,运用河岸带完整性指数、地积累指数、污染负荷指数等多种解析方法分析评价了吴江桃源镇问津河待整治河段的河岸带完整性、河流水质以及沉积物中重金属的污染程度。评价结果表明,问津河水体及其沉积物受外源污染严重,水体呈现严重的富营养化,污染底泥不仅形成强烈的内源释放,还对河流水生态系统构成了较为强烈的生态风险。然而,由于人为干预程度不同,不同河段河岸带的生态完整性呈现明显差异,具有完整河岸带的河段呈现多样性的地貌特征,不仅与滨水区的水生植被形成良好的自然景观,对于拦截面源污染和净化水质也发挥了重要的作用,需要在整治工程中加以重点保护。

Based on the field survey data of the target reach of ecological regulation of the Wenjin River in Wujiang in 2018, the ecological integrity of riparian zone, the physical and chemical status of river water and the status of heavy metal pollution in sediments were analyzed and evaluated by various methods. The evaluation results show that both water and sediments pollution of the Wenjin River are mainly caused by external sources.The pollution degree of heavy metals results in a high ecological risk.The ecological integrity of riparian zones in different river sections show significant differences due to different degrees of human intervention. The river reach with complete riparian zone needs to be protected in the renovation project on account of the diverse geomorphological features it presents, which not only forms a good natural landscape with aquatic vegetation in the waterfront area, but also plays an important role in intercepting cross-section source pollution and purifying water quality.