福建晋江流域锰负荷分布及源区识别

以福建晋江流域锰元素为研究对象，将整个流域划分为60个子流域并在各子流域出口处设置水质监测断面，分别于丰水期和枯水期对断面锰浓度进行取样测试，研究锰浓度的时空分布特征。结合流量监测和降水资料，利用水文比拟法计算并总结锰负荷的空间分布，基于锰负荷贡献率进行了锰源区识别。结果表明：丰水期锰浓度普遍高于枯水期，西溪锰浓度总体高于东溪。受矿山开采影响，全年锰浓度最大值位于上游双溪与大畬溪交汇处。锰负荷丰水期远高于枯水期，且具有随径流向下游聚集的趋势，最大值位于晋江流域最下游入海口断面。识别出的锰源区主要位于西溪流域以及干流下游临入海口子流域，应在今后的环境综合治理工作中重点关注。

Spatial distribution and source identification of manganese load in Jinjiang watershed,Fujian Province

Manganese pollution in the Jinjiang watershed of Fujian Province is a key research object. In this study, the entire watershed was divided into 60 sub-watersheds and water quality monitoring sections were set up at the outlets of each sub-watershed. Surface water samples were collected and tested during the flood and dry periods, and the temporal and spatial distribution characteristics of the manganese concentration were analyzed. Combined with flow monitoring and precipitation data, the spatial distribution of manganese load was calculated and analyzed by using hydrological analogy, and the source of manganese pollution was identified based on the load contribution rate. The results showed that the manganese concentration in the flood period was generally higher than that in the dry period, and the manganese concentration in west stream was generally higher than that in east stream. Due to mining, the maximum annual manganese concentration is located at the intersection of the Shuang Stream and the Dashe Stream. In that place the manganese load is much higher in the flood period than that in the dry period, which has a tendency to accumulate downstream with the runoff. The maximum value of manganese occurred at the section of the whole downstream of the Jinjiang watershed. As a result, the identified manganese source areas mainly located in the west stream and sub-watershed near estuary, where should be focused on in the future for comprehensive environmental management work.