Water and nitrate exchange between a managed river and peri-urban floodplain aquifer: Quantification and management implications
Water and nitrate exchange between a managed river and peri-urban floodplain aquifer: Quantification and management implications
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管理河流与城市周边洪泛区含水层之间的水和硝酸盐交换：量化和管理影响
DOI：
10.1016/j.ecoleng.2018.09.005
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发表时间：
2018
影响因子：
3.8
通讯作者：
Macdonald D
中科院分区：
文献类型：
--
作者：
Macdonald D
管理用于航运、水电和减少洪水风险的河流涉及安装河道内结构。这些会影响河流水位，并可能影响水力连接的河岸泛滥平原含水层内的地下水流动。使用了联合王国南部一个全面监测的城市周边低地河流泛滥平原，以探索这些依赖关系，并审查对河流和泛滥平原冲积含水层之间水和硝酸盐通量交换的影响。研究表明，河流通过管理结构维持在较高的水位，导致邻近含水层的地下水位上升，地下水流动格局复杂。工程河流管理结构被证明可以促进河流通过河床流向含水层，但大部分相关的硝酸盐在潜流带中被清除。高硝酸盐地下水对冲积含水层的补给也是通过漫滩洪水发生的。在整个泛滥平原，由于富含碳的沉积物和浅地下水位造成的厌氧条件，发生了大量的反硝化作用，后者与河流管理结构有关。据估算，研究区河水每年从河水中去除的硝酸盐总量上限为2.9 × 10 4 kg，比河道内硝酸盐年通量估计值(1.8 × 10 7 kg)低3个数量级。然而，这种低地泛滥平原降低地下水硝酸盐浓度的能力对当地有好处，例如对来自冲积含水层的私人和公共供水。这项研究的见解对那些考虑包括安装、拆除或重新设计河流管理结构的方案的人也有意义，因为由此引起的地下水位变化可能会对泛滥平原草甸和水生系统的营养状况产生影响。
The management of rivers for navigation, hydropower and flood risk reduction involves the installation of in-channel structures. These influence river levels and can affect groundwater flow within hydraulically-connected riparian floodplain aquifers. A comprehensively monitored, peri-urban, lowland river floodplain in the southern United Kingdom was used to explore these dependencies and to examine the implications for the flux exchange of water and nitrate between the river and the floodplain alluvial aquifer. The study demonstrated that rivers maintained at high levels by management structures, result in raised groundwater levels in the adjacent aquifer and complex groundwater flow patterns. Engineered river management structures were shown to promote flow from river to aquifer through the river bed but the majority of the associated nitrate was removed in the hyporheic zone. High-nitrate groundwater recharge to the alluvial aquifer also occurred through overbank flood flows. Across the floodplain, substantial denitrification occurred due to anaerobic conditions resulting from carbon-rich sediments and the shallow water table, the latter linked to the river management structures. An upper limit on the total annual mass of nitrate removed from river water entering the floodplain aquifer was estimated for the study site (2.9 × 104kg), which was three orders of magnitude lower than the estimate of annual in-channel nitrate flux (1.8 × 107kg). However, this capacity of lowland floodplains to reduce groundwater nitrate concentrations has local benefits, for example for private and public water supplies sourced from alluvial aquifers. The insights from the study also have relevance for those considering schemes that include the installation, removal or redesign of river management structures, as the resultant change in groundwater levels may have consequences for floodplain meadows and the nutrient status of the aquatic system.
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大河流漫滩地下水硝酸盐浓度的变化：反硝化、吸收还是混合？
影响因子：
--
作者：
G. Pinay;C. Ruffinoni;S. Wondzell;F. Gazelle
通讯作者：
F. Gazelle
影响因子：
3.2
作者：
Hill, Alan R.;Duval, Tim P.
通讯作者：
Duval, Tim P.
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
K. Blasch;J. Constantz;D. Stonestrom
通讯作者：
D. Stonestrom
影响因子：
3.2
作者：
Burt, TP;Matchett, LS;Haycock, NE
通讯作者：
Haycock, NE
影响因子：
6.4
作者：
T. Burt;G. Pinay;F. Matheson;N. Haycock;A. Butturini;J. Clément;S. Danielescu;D. Dowrick;M. Hefting;A. Hillbricht-Ilkowska;V. Maı̂tre
通讯作者：
T. Burt;G. Pinay;F. Matheson;N. Haycock;A. Butturini;J. Clément;S. Danielescu;D. Dowrick;M. Hefting;A. Hillbricht-Ilkowska;V. Maı̂tre