Impact of summer droughts on the water quality of the Meuse river
Impact of summer droughts on the water quality of the Meuse river
复制标题
DOI：
10.1016/j.jhydrol.2008.01.001
复制
发表时间：
2008-05
影响因子：
6.4
通讯作者：
M. V. van Vliet;J. Zwolsman
中科院分区：
文献类型：
--
作者：
M. V. van Vliet;J. Zwolsman
气候变化可能会增加河流低流量的频率和强度，影响水量和水质。虽然气候变化对水量的影响得到了广泛的认可，但对水质的影响却鲜为人知。本文的目的是评估干旱对西欧默兹河水质的影响，根据现有的水质数据分析。在1976年和2003年发生的两次严重干旱期间，在两个监测站的水质时间序列进行了调查。对这些干旱期间的水质进行了调查，并与参考期间的水质进行了比较，代表了共同的水文条件和类似的化学污染。共涉及24个水质参数，可分为4组：（1）一般水质变量（水温，叶绿素a，pH值，溶解氧和悬浮固体），（2）营养盐，（3）主要元素（如氯化物，氟化物）和（4）重金属和类金属。为了评估流量和水温变化对化学物质浓度的影响，建立了浓度与流量、浓度与水温之间的经验关系。结果表明，干旱期间的默兹河的水质普遍恶化，相对于水温，富营养化，主要元素，以及一些重金属和类金属。水质下降的主要原因是有利于藻类大量繁殖的条件（水温高、停留时间长、营养物浓度高）和点源废水稀释能力的降低。
Climate change will probably increase the frequency and intensity of low river flows, affecting both water quantity and water quality. Although climate change impacts on water quantity are widely recognised, the impacts on water quality are less known. The aim of this paper is to assess the effects of droughts on the water quality of the river Meuse in western Europe, based on analysis of existing water quality data. Time series of water quality were investigated at two monitoring stations during two severe drought periods, occurring in the years 1976 and 2003. Water quality during these droughts was investigated and compared to water quality during reference periods, representing common hydrological conditions and similar chemical pollution. A total amount of 24 water quality parameters were involved in the analysis, which can be divided into four groups: (1) general water quality variables (water temperature, chlorophyll-a, pH, dissolved oxygen and suspended solids), (2) nutrients, (3) major elements (e.g. chloride, fluoride) and (4) heavy metals and metalloids. To assess the effects of changes in discharge and water temperature on the concentration of chemical substances, empirical relations have been established between concentration and discharge, and between concentration and water temperature. The results indicate a general deterioration of the water quality of the Meuse river during droughts, with respect to water temperature, eutrophication, major elements, and some heavy metals and metalloids. This decline in water quality is primarily caused by favourable conditions for the development of algae blooms (high water temperatures, long residence times, high nutrient concentrations) and a reduction of the dilution capacity of point source effluents.