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Geophysical reconnaissance of the western basin of the Plaine du Nord aquifer, Haiti
Hydrogeology Journal ( IF 2.8 ) Pub Date : 2022-06-03 , DOI: 10.1007/s10040-022-02490-9
Wm. Javan Miner , James K. Adamson , James C. Hasbrouck , Sergio Perez Monforte , María Rodriguez Vera

A geophysical reconnaissance was conducted to support aquifer characterization and evaluate groundwater potential in the western portion of the Plaine du Nord aquifer to provision the growing water demands of the city of Cap-Haitien in the Republic of Haiti. Hybrid-source audio-magnetotelluric (HSAMT) soundings and gravity measurements were collected to support the Government of Haiti in sourcing additional water supplies for the city. The Plaine du Nord aquifer is poorly characterized considering it is one of Haiti’s largest aquifers, few drilling logs are available, and only one borehole has investigated the deeper extents of the aquifer. HSAMT supports depth profiling of subsurface resistivity, which supports interpretations of geological strata and groundwater conditions. Gravity measurements allow for complementary mapping of Earth density anomalies and contrasts, which assist in interpreting aquifer thicknesses or depth to bedrock. Pairing HSAMT and gravity methods permitted both an estimation of aquifer thickness and relative changes in sediment characteristics. Gravity results allowed for the mapping of aquifer thickness across the study area, with interpreted thickness greater than 300 m in the coastal zone. HSAMT results cross correlated with available well records and enabled the delineation of zones with increased groundwater potential. The results of the combined methods indicate groundwater storage potential of freshwater in deeper alluvium and emphasize the importance of strengthening resource characterization, modelling and monitoring to guide sustainable resource development and management.



中文翻译:

海地Plaine du Nord含水层西部盆地的地球物理勘察

为了满足海地共和国海地角市不断增长的用水需求,我们进行了地球物理勘测,以支持北平原含水层西部的含水层特征和评估地下水潜力。收集了混合源音频-大地电磁 (HSAMT) 探测和重力测量结果,以支持海地政府为该市采购额外的供水。Plaine du Nord 含水层的特征很差,因为它是海地最大的含水层之一,可用的钻井日志很少,而且只有一个钻孔调查了含水层的更深范围。HSAMT 支持地下电阻率的深度剖析,从而支持对地质地层和地下水条件的解释。重力测量允许对地球密度异常和对比进行互补映射,这有助于解释含水层厚度或基岩深度。配对 HSAMT 和重力方法允许估计含水层厚度和沉积物特征的相对变化。重力结果允许绘制整个研究区域的含水层厚度图,解释的海岸带厚度大于 300 m。HSAMT 结果与可用的井记录相互关联,并能够划定地下水潜力增加的区域。组合方法的结果表明了深层冲积层淡水的地下水储存潜力,并强调了加强资源表征、建模和监测以指导可持续资源开发和管理的重要性。

更新日期:2022-06-06
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