Water quality along a river continuum subject to point and diffuse sources
Water quality along a river continuum subject to point and diffuse sources
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DOI：
10.1016/j.jhydrol.2007.10.034
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发表时间：
2008-02
影响因子：
6.4
通讯作者：
C. Neal;H. Jarvie;A. Love;M. Neal;H. Wickham;Sarah A Harman
中科院分区：
文献类型：
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作者：
C. Neal;H. Jarvie;A. Love;M. Neal;H. Wickham;Sarah A Harman
从点营养物输入和扩散营养物输入的影响方面对英格兰南部泰晤士河流域肯尼特河沿着的水质进行了检查。该河流主要由白垩纪白垩含水层供水，因此沃茨属于碳酸氢钙类型。硝酸盐主要来自农业来源，由于植物吸收和可能的反硝化作用，浓度在下游下降。相比之下，可溶性活性磷（SRP）主要与污水输入和浓度增加下游符合主要城镇，如纽伯里和阅读的污水。邻近河流的下半部分是Kennet和Avon运河，两者在水文上相连。运河输入可能会影响碳酸钙（方解石）沉淀和增加悬浮泥沙和颗粒磷浓度的河流。监测上游和下游的马尔伯勒污水处理厂（STW）表明，在流出物中的SRP浓度是高度可变的，由于可变效率的P剥离，仍然足够集中，以主导下游河流SRP与河流生态的潜在影响。污水处理厂除磷后，这条河流的生物恢复是复杂的，控制SRP中超过100μgl− 1阈值的峰值可能是一个关键要求。可能需要比目前推荐的更严格的排放目标（低于800μgRPl−1），以实现该河流的良好生态状态，这取决于上游的SRP浓度。
The water quality along the River Kennet, in the Thames basin of southern England, was examined in terms of the influence of point- and diffuse-nutrient inputs. The river is supplied mainly from a Cretaceous Chalk aquifer and hence the waters are of a calcium bicarbonate type. The nitrate largely comes from agricultural sources, with concentrations decreasing downstream due to plant uptake and probable denitrification. In contrast, soluble reactive phosphorus (SRP) is largely associated with sewage inputs and concentrations increase downstream in line with effluents from major towns such as Newbury and Reading. Adjacent to the river in the lower half of the catchment is the Kennet and Avon Canal and the two are in places hydrologically connected. The canal inputs may influence calcium carbonate (calcite) precipitation and increase suspended sediment and particulate phosphorus concentrations in the river. Monitoring upstream and downstream of Marlborough sewage treatment works (STW) showed that SRP concentrations in the effluent were highly variable due to variable efficiency of P stripping and still sufficiently concentrated to dominate downstream river SRP with potential impacts on stream ecology. Biological recovery in this river following P stripping at STWs is complex and controlling those spikes in SRP that are above a threshold of 100μgl−1may be a critical requirement. More stringent effluent targets than are currently recommended may be needed (less than 800μgRPl−1) to achieve good ecological status in this river depending on SRP concentrations upstream.