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首页> 外文期刊>Journal of environmental & engineering geophysics >Characterizing a Shallow Groundwater System beneath Irrigated Sugarcane with Electrical Resistivity and Radon (Rn-222) Puunene, Hawaii
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Characterizing a Shallow Groundwater System beneath Irrigated Sugarcane with Electrical Resistivity and Radon (Rn-222) Puunene, Hawaii

机译：用电阻率和Rad（Rn-222）夏威夷普尼尼表征甘蔗灌溉下的浅层地下水系统

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In this study, we use a combination of electrical resistivity profiling and radon (Rn-222) measurements to characterize a shallow groundwater system beneath the last remaining, large-scale sugarcane plantation on Maui, Hawaii. Hawaiian Commercial & Sugar Company has continuously operated a sugarcane plantation on the western flank of Haleakala Volcano since 1878. The sugarcane is irrigated with a combination of surface water brought through tunnels from the wetter, eastern flank of Haleakala Volcano and groundwater from wells within the plantation. To assess the flow of irrigation water through the shallow subsurface, we collected a representative topo-sequence of four 2-D resistivity profiles that sample different topographic and hydrologic settings within the plantation. The profiles show a down-slope-thickening (0 to 20 m), surficial low-resistivity (10-200 Ohm-m) layer extending from the upslope limit of irrigated sugarcane to the lowest elevations of the plantation. At a canal crossing, the low resistivity layer thickens and is less resistive upslope of the canal. Beneath a reservoir at mid-elevation, the layer thickens to 20 m and curves down slope beneath the reservoir and up to the base of the field beyond. At the base of the slope, the low resistivity layer is 20-m thick below both fields and a second reservoir. An increase in radon concentration in the down-flow direction within the canal system at one location suggests groundwater infiltration into the canal. We attribute the low-resistivity layer to irrigation water that has infiltrated below the root zone and leaked from canals and reservoirs within the plantation. The water flows down slope to the base of the slope and there flows vertically, recharging the basal aquifer. We suggest that seepage from the canals and reservoirs is in part controlled by the local pressure head within the shallow flow system.
机译：在这项研究中，我们结合使用电阻率分析和ra（Rn-222）测量来表征夏威夷毛伊岛最后一个剩余的大规模甘蔗种植园下面的浅层地下水系统。夏威夷商业与糖业公司自1878年以来就在哈莱阿卡拉火山西翼连续经营甘蔗种植园。甘蔗采用从哈莱阿卡拉火山湿润的东翼通过隧道运来的地表水和种植园内井中的地下水进行灌溉。 。为了评估灌溉水通过浅层地下的流量，我们收集了四个代表性的二维电阻率剖面的地形序列，这些剖面对人工林内不同的地形和水文环境进行了采样。剖面图显示了下坡的厚度（0至20 m），表面低电阻率（10-200 Ohm-m）的层，从灌溉的甘蔗的上坡极限延伸到种植园的最低海拔。在运河穿越时，低电阻率层变厚，且运河的电阻上坡较少。在高程中间的一个储层之下，该层增厚至20 m，并沿储层下方的斜坡向下倾斜，直至向上的田野底部。在斜坡的底部，低电阻率层在两个场和第二个储层下面都厚20 m。在某个位置，渠道系统内向下流方向的ra浓度增加，表明地下水渗透到渠道中。我们将低电阻率层归因于灌溉水，这些灌溉水渗透到了根区以下，并从人工林的渠道和水库中泄漏出来。水从坡道向下流到坡道的底部，然后垂直流入，为基础含水层补给水。我们认为，来自运河和水库的渗漏部分受浅水流系统内的局部压力头控制。

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