Penetration depth as a DInSAR observable and proxy for soil moisture
Penetration depth as a DInSAR observable and proxy for soil moisture
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DOI：
10.1109/tgrs.2003.809931
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发表时间：
2003-03-01
影响因子：
8.2
通讯作者：
Fatland, DR
中科院分区：
文献类型：
--
作者：
Nolan, M;Fatland, DR
利用已有的理论和实验结果，建立了L波段、C波段和X波段土壤水分与合成孔径雷达微波穿透深度之间的定量关系。这种关系是非线性的，表明体积含水率(VWC)每变化5%，C波段穿透深度就会发生1-50 mm的变化，具体取决于初始VWC。由于这些深度在差分干涉合成孔径雷达(DInSAR)的测量能力范围内，因此穿透深度可能是测量土壤水分的一个可行的替代方法。DInSAR不太可能探测到超过30%VWC的渗透深度的可测量变化，尽管某些富含粘土的土壤可能会继续导致高于该水平的地表变形。用粘土膨胀来代替土壤水分的可能性被发现比渗透深度更不可行。在使用重复通过DInSAR测量细微变形信号或创建数字高程模型时，土壤湿度也可能是以前未被识别的重要噪声源。
We use prior theory and experimental results to construct a quantitative relationship between soil moisture and the penetration depth of synthetic aperture radar (SAR) microwaves at L-, C-, and X-bands. This relationship is nonlinear and indicates that a change of 5% volumetric water content (VWC) can cause between 1 and 50 mm of change in C-band penetration depth depending on initial VWC. Because these depths are within the range of differential interferogram SAR (DInSAR) measurement capability, penetration depth may be a viable proxy for measuring soil moisture. DInSAR is unlikely to detect a measurable change in penetration depth above 30% VWC, though certain clay rich soils may continue to cause surface deformation above that level. The possibility of using clay swelling as a proxy for soil moisture was found to be less feasible than penetration depth. Soil moisture may also be a significant, and previously unrecognized, source of noise in the measurement of subtle deformation signals or the creation of digital elevation models using repeat-pass DInSAR.