三峡水库水质变化趋势研究

发布时间：2018-05-08 19:15

  本文选题：水质 + 趋势　； 参考：《长江流域资源与环境》2017年06期

【摘要】：为全面研究三峡水库蓄水之前至175 m蓄水运行期库区水质变化趋势和因蓄水导致水文条件变化后悬浮物、高锰酸盐指数、总磷等主要污染因子变化及其相互关系,通过对2000~2015年三峡水库水体水质状况进行分析,得出如下结论:三峡水库干流水质较好,其受水期及水库蓄水调度影响明显但逐渐减弱。受蓄水导致的水流条件变化、上游来水、支流汇入及沿程点面源污染等因素影响,干流沿程各断面水质变化趋势不完全一致;除清溪场和沱口断面外,从库尾到库首水质评价结果优于Ⅲ类的比例总体呈上升趋势。受蓄水影响,御临河、小江、大宁河及香溪河河口断面水质均呈下降趋势。三峡水库上游来水悬浮物含量变化与水期存在较好相关性,但自2013年开始上游来水各水期悬浮物含量均下降,悬浮物通量较2013年之前平均降低约80%。水库库中、库首断面近年来悬浮物含量在丰水期和平水期下降,其后逐渐趋于稳定,枯水期变化不明显。蓄水后主要支流河口悬浮物含量大部分时段低于库区干流同期,上游支流河口断面悬浮物含量受水期影响较库区中下游支流河口明显。干支流各断面高锰酸盐指数和总磷在各水期变化趋势各异,上游断面丰水期变化较下游断面明显;随着蓄水进程,各断面高锰酸盐指数和总磷在平水期和枯水期之间、断面间差异越来越小。悬浮物含量与高锰酸盐指数、总磷等参数之间存在一定的相关性,但在较长时间范围,不能通过拟合等手段将水样一种状态的测定结果推出样品另一种状态近似检测结果。
[Abstract]:In order to study the change trend of water quality of the three Gorges Reservoir from 175m to 175m, and the change of suspended matter, permanganate index, total phosphorus and other main pollution factors after the change of hydrological conditions caused by water storage, and the relationship between them, the change of water quality and the relationship between suspended matter, permanganate index and total phosphorus were studied. Through the analysis of the water quality of the three Gorges Reservoir from 2000 to 2015, the following conclusions are drawn: the water quality of the main stream of the three Gorges Reservoir is good, which is obviously affected by the water period and the reservoir impoundment operation, but gradually weakens. Affected by the change of water flow condition caused by impoundment, upstream water coming, tributaries confluence and non-point pollution along the course, the variation trend of water quality of each section along the main stream is not completely consistent, except for Qingxi Chang and Tuokou section, The proportion of water quality evaluation from the tail of reservoir to the head of reservoir is better than that of class 鈪，

本文编号：1862695