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首页> 外文会议>International Symposium on Land Subsidence >Mitigating Land Subsidence in the Coachella Valley, California, USA: An Emerging Success Story
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Mitigating Land Subsidence in the Coachella Valley, California, USA: An Emerging Success Story

机译：在美国加利福尼亚州Coachella Valley的减轻土地沉降：一个新兴成功的故事

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Groundwater has been a major source of agricultural, municipal, and domestic water supply since the early 1920s in the Coachella Valley, California, USA. Land subsidence, resulting from aquifer-system compaction and groundwater-level declines, has been a concern of the Coachella Valley Water District (CVWD) since the mid-1990s. As a result, the CVWD has implemented several projects to address groundwater overdraft that fall under three categories - groundwater substitution, conservation, and managed aquifer-recharge (MAR). The implementation of three projects in particular - replacing groundwater extraction with surface water from the Colorado River and recycled water (Mid-Valley Pipeline project), reducing water usage by tiered-rate costs, and increasing groundwater recharge at the Thomas E. Levy Groundwater Replenishment Facility - are potentially linked to markedly improved groundwater levels and subsidence conditions, including in some of the historically most overdrafted areas in the southern Coachella Valley. Groundwater-level and subsidence monitoring have tracked the effect these projects have had on the aquifer system. Prior to about 2010, water levels persistently declined, and some had reached historically low levels by 2010. Since about 2010, however, groundwater levels have stabilized or partially recovered, and subsidence has stopped or slowed substantially almost everywhere it previously had been observed; uplift was observed in some areas. Furthermore, results of Interferometric Synthetic Aperture Radar analyses for 1995-2017 indicate that as much as about 0.6 m of subsidence occurred; nearly all of which occurred prior to 2010. Continued monitoring of water levels and subsidence is necessary to inform the CVWD about future mitigation measures. The water management strategies implemented by the CVWD can inform managers of other overdrafted and subsidence-prone basins as they seek solutions to reduce overdraft and subsidence.
机译：自20世纪20年代初以来，地下水是农业，市政和国内供水以来的主要来源。由于含水层 - 系统压实和地下水位下降导致的土地沉降，自20世纪90年代中期以来一直是Coachella Valley Pater区（CVWD）的关注。因此，CVWD已经实施了几个项目，以解决地下水透支地处理下面的三类 - 地下水替代，保护和管理含水层 - 充值（MAR）。特别是三个项目的实施 - 用科罗拉多河和再生水（中谷管道项目）的地表水取代地下水提取，减少了分层率成本的用水量，并增加了托马斯E.征收地下水补货的地下水补给设施 - 与地下水位和沉降条件有可能与地下水位和沉降条件相关联，包括南部教练谷的一些历史上最普遍的地区。地下水位和沉降监测已经跟踪了这些项目在含水层系统上的效果。在大约2010年之前，水位持续下降，有些人到2010年历史低水平。然而，自大约2010年以来，地下水位稳定或部分地恢复，并且沉降已经停止或大幅度地观察到的地方;在某些地区观察到隆起。此外，1995 - 2017年干涉性合成孔径雷达分析的结果表明，大约0.6米的沉降;几乎所有这些都发生在2010年之前。继续监测水位和沉降，以通知CVWD关于未来的缓解措施。由CVWD实施的水管理策略可以在寻求解决透支和沉降的解决方案时为其他透水和俯卧盆地的管理人员提供信息。

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