ABSTRACT

Excessive groundwater extraction is exacerbated by worsening droughts under climate change. Among agricultural users, well-drilling activity is not evenly distributed. The number, diameter and depth of new agricultural wells were analysed in this study in relation to farm size and land cover class during California’s 2012–16 extreme drought. The results show smaller farms drilled at higher rates, whereas larger farms drilled at comparatively greater depths and with wider wellbores. Sections dominated by permanent crops drilled at 2.4 times the rate of those dominated by annual crops, and at 24.7 times the rate of forest and rangeland dominated sections.

摘要

气候变化下的干旱加剧加剧了地下水的过度开采。在农业用户中，钻井活动分布不均。本研究分析了加州 2012-16 年极端干旱期间与农场规模和土地覆盖等级相关的新农业井的数量、直径和深度。结果显示，较小的农场以较高的速度钻探，而较大的农场以相对较大的深度和较宽的井眼进行钻探。以多年生作物为主的地段的开钻率是一年生作物为主的地段的 2.4 倍，是森林和牧场为主的地段的 24.7 倍。