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首页> 外文会议>Symposium on the Application of Geophysics to Engineering and Environmental Problems >AEM-BASED HYDROGEOLOGICAL FRAMEWORKS IN THE CENTRAL VALLEY OF CALIFORNIA
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AEM-BASED HYDROGEOLOGICAL FRAMEWORKS IN THE CENTRAL VALLEY OF CALIFORNIA

机译：基于AEM的加利福尼亚中央谷的水文地质框架

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Airborne electromagnetic (AEM) surveys were conducted in the Central Valley of California to develop a hydrogeological framework and to assist in water resources management. AEM and magnetic Total Field data were acquired and interpreted in conjunction with other background information to develop a 3D hydrogeologic framework. Maps of aquifer materials including potential Managed Aquifer Recharge (MAR) areas and new drilling locations were identified. Borehole resistivity logs, integrated into the AEM inversion and hydrogeologic interpretation process, provided ground truth and showed good agreement with the AEM inversion results. The AEM indicated that the location and thickness of the Corcoran clay, the lithologic unit related to subsidence in the Valley, is continuous only along the eastern edge of the mapped area (towards the Valley center) and becomes discontinuous to nonexistent towards the west. The final interpretation imaged the aquifer and non-aquifer materials within the project area and divide them into distinct lithologic units. Subsurface paleochannels and alluvial fans were also observed coming in from the west, providing conduits for recharge. The AEM results clearly showed areas of coarse grained unsaturated aquifer material extending downwards from the land surface that can store additional water for MAR and also accurate locations of Aquifer Storage and Recovery (ASR) which can place water under pressure beneath the clay zones within the confined aquifer material, keeping aquifer pressures up. Using AEM results and volume calculations, locating future wells is empirically based, allowing for optimal use of water development funding and for planning future irrigation. The 3D understanding from the AEM surveys allows for estimating aquifer material volume contributing to a production well and for understanding interference potential between wells. AEM data have allowed for a more accurate portrayal of the natural system than previous efforts using borehole information alone.
机译：在加利福尼亚中央山谷进行空中电磁（AEM）调查，以发展水文地质框架，并协助水资源管理。 AEM和磁总现场数据被获取和解释与其他背景信息结合，以开发3D水文框架。确定了包括潜在的管理含水层补给（MAR）区域和新钻井地点的含水层材料的地图。钻孔电阻率日志，集成到AEM反转和水文地质解释过程中，提供了地面真理，并与AEM反转结果表现出良好的一致性。 AEM表示，Corcoran粘土的位置和厚度，与山谷沉降有关的岩性单元，仅沿着映射区域的东部边缘（朝向谷中心），并且对西方不连续。最终的解释在项目区内的含水层和非含水层材料进行了成像，并将它们分成了独特的岩性单位。来自西方的地下古科基尔和冲积粉丝也被观察到，提供用于充值的管道。 AEM结果清楚地显示了从陆地表面向下延伸的粗粒粗糙的不饱和含水层材料的区域，这些材料可以存储额外的水域，也可以将含水层储存和恢复（ASR）的准确位置储存，这可以将水放置在克莱区内的压力下的挤压件含水层材料，保持含水层压力。使用AEM的结果和卷计算，定位未来的井是基于凭证的，允许最佳利用水开发资金和规划未来灌溉。来自AEM调查的3D理解允许估计含水层材料体积良好的生产效果，并用于了解井之间的干扰电位。 AEM数据允许对自然钻孔信息的以前的努力更准确地描绘自然系统。

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