Urban impact in Groundwater Levels in Dakar Shallow Aquifer (SENEGAL)
Urban impact in Groundwater Levels in Dakar Shallow Aquifer (SENEGAL)
复制标题
城市对达喀尔浅层含水层地下水位的影响（塞内加尔）
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Faye
中科院分区：
文献类型：
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作者：
O. Diouf;S. Faye
盖维特半岛大部分地区的第四纪砂质沉积物蕴藏着相当丰富的地下水资源。在人口密集的郊区，地下含水层面临着人为地表污染诱导补给和地下水位上升等重大问题。近年来，地下水位的上升在一定程度上造成了城市洪水事件的反复发生，造成了环境和健康问题。在这种情况下，本研究的目的是利用长期地下水监测水平和降雨数据来描述城市和降雨对达喀尔第四纪砂质含水层地下水位的影响。达喀尔约夫气象站的月降雨量分析显示，1970年以来降雨量不足。在2010-2012年期间，利用位于郊区（P3-1和PSQ1）的两个气压计中的“ Thalimede Orpheus mini ”记录仪监测地下水水位响应降水的季节性波动，以确定地下水响应降雨事件的波动。此外，我们还调查了位于居民区（PS10、PS11、P2-10、P2-9和P2-7）和城区（P2-6、P2-2和P2-5）的几个气压计的长期水位记录，以推断城市和降雨对地下水位的影响。结果表明：70年代以来，城郊地区地下水水位因污水入渗而上升，居住区水位因降水不足而下降。
The Quaternary Sandy sediments which cover most part of the Cap Vert peninsula bear considerable groundwater resources. The aquifer laying beneath a densely populated suburb zone is encountered major issues such as induced recharge from anthropogenic surface derived pollution and rising water table to groundsurface. This groundwater level rising contributes in part to recurrent urban flooding events in recent years, causing environmental and health problems. In this context, the present study aims at characterizing urban and rainfall impact on the groundwater level of Dakar quaternary sandy aquifer using long term groundwater monitoring levels and rainfall data. Monthly rainfall analysis in Dakar-yoff meteorological station indicate rainfall deficit since 1970. Seasonal fluctuations of groundwater levels in response to precipitation are monitored during time period (2010-2012) using “Thalimede Orpheus mini” recorders in two piezometers located in the suburban area (P3-1 and PSQ1) in order to determine groundwater fluctuations in response to rainfall events. In addition to that, long term water level records in few piezometers, located in the inhabited area (PS10, PS11, P2-10, P2-9 and P2-7) and in the urban area (P2-6, P2-2 and P2-5) were investigated to infer urban and rainfall impact in the groundwater levels. Results indicated a groundwater levels rising in the periurban area due to waste water infiltration and a water levels decline in the inhabited areas related to rainfall deficit since the 70s.