Quantification of groundwater recharge in the city of Nottingham, UK
Quantification of groundwater recharge in the city of Nottingham, UK
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DOI：
10.1007/s002540050414
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发表时间：
1999-09
期刊：
影响因子：
--
通讯作者：
Y. Yang;D.N Lerner;M. Barrett;J. Tellam
中科院分区：
文献类型：
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作者：
Y. Yang;D.N Lerner;M. Barrett;J. Tellam
地下水是城市供水的重要且宝贵的资源。为了充分、明智地利用资产价值，需要清楚地了解城市地下水补给的数量和来源。供水和处理网络往往是通过总水管和下水道渗漏补充城市地下水的重要来源。使用诺丁汉（英国）城市含水层开发并说明了确定三种城市补给源（降水、干管和下水道）空间和时间量的方法。校准的地下水流模型由三个保守物种（Cl、SO4 和总 N）的校准溶质平衡进行补充，从而提供了用于补给估算的四行证据。诺丁汉位于三叠纪砂岩含水层上，平均降水量为 700 毫米/年。使用这些模型，目前的城市补给量估计为 211 毫米/年，其中 138 毫米/年 (±40%) 来自干线渗漏，10 毫米/年 (±100%) 来自下水道渗漏。宽的置信区间是由于历史现场数据的稀缺和这个大容量含水层的周转时间长造成的，对于许多其他含水层系统来说，置信区间应该要低得多。
Groundwater is an important and valuable resource for water supply to cities. In order to make full and wise use of the asset value, a clear understanding of the quantities and sources of urban groundwater recharge is needed. The water supply and disposal network is often an important source of recharge to urban groundwater through leakage from water mains and sewers. An approach to establishing the spatial and temporal amounts of the three urban recharge sources (precipitation, mains and sewers) is developed and illustrated using the Nottingham (UK) urban aquifer. A calibrated groundwater flow model is supplemented by calibrated solute balances for three conservative species (Cl, SO4and total N), thus providing four lines of evidence to use in the recharge estimation. Nottingham is located on a Triassic sandstone aquifer with average precipitation of 700 mm/year. Using the models, current urban recharge is estimated to be 211 mm/year, of which 138 mm/year (±40%) is from mains leakage and 10 mm/year (±100%) is from sewer leakage. The wide confidence intervals result from the scarcity of historical field data and the long turnover time in this high volume aquifer, and should be significantly lower for many other aquifer systems.