GRACE卫星在美国也监测到了同样的地下水消耗，包括西部平原的奥加拉拉含水层和加州中央峡谷地区的地下水大量消耗。
And GRACE has detected similar depletion in the U. S., as well, including the Ogallala Aquifer under the western plains and the groundwater in the California's Central Valley.
地下水污染监测网的设计包括取样点在空间上的采样位置和时间上的取样频率这两方面的确定，其目的是为了准确刻画污染羽在含水层中随时间的变化状况。
The groundwater monitoring network design involves the determination of the sampling locations and sampling frequencies to characterize the contaminant plume in an aquifer over space and time.
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