Temporal stability of soil moisture patterns measured by proximal ground-penetrating radar
Temporal stability of soil moisture patterns measured by proximal ground-penetrating radar
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DOI：
10.5194/hessd-10-4063-2013
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
J. Minet;N. Verhoest;S. Lambot;M. Vanclooster
中科院分区：
文献类型：
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作者：
J. Minet;N. Verhoest;S. Lambot;M. Vanclooster
我们分析了三周内五个不同日期在 2.5 公顷农田中使用近端探地雷达 (GPR) 获取的土壤湿度模式的时间稳定性。 GPR 系统安装在移动平台上，可以以高空间分辨率（2-5 m）实时绘制土壤湿度图。土壤湿度的时空模式与气象数据和土壤岩芯采样的土壤湿度测量结果一致。显示田间平均湿度的时间稳定区域可以通过两种方法揭示：（1）根据土壤湿度与田间平均湿度的相对差异计算时间稳定性指标；（2）通过显示田间平均湿度的区域的空间交集。平均相对差值低于 0.02 m3 m−3 的位置延伸至视场面积的 10%，而显示视场平均值在 0.02 m3 m−3 公差范围内的区域的交集覆盖了视场面积的 5%。与之前大多数关于土壤湿度时间稳定性的研究相比，由于先进的探地雷达实时测绘方法，可以揭示时间稳定区域及其空间模式，而不是单点位置。据信，确定空间相干时间稳定区域比确定时间稳定点提供更多信息。为了保证时间稳定区域的稳健性，需要在更长的时间内进行其他收购。
We analyzed the temporal stability of soil moisture patterns acquired using a proximal ground-penetrating radar (GPR) in a 2.5 ha agricultural field at five different dates over three weeks. The GPR system was mounted on a mobile platform, allowing for real-time mapping of soil moisture with a high spatial resolution (2–5 m). The spatio-temporal soil moisture patterns were in accordance with the meteorological data and with soil moisture measurements from soil core sampling. Time-stable areas showing the field-average moisture could be revealed by two methods: (1) by the computation of temporal stability indicators based on relative differences of soil moisture to the field-average and (2) by the spatial intersection of the areas showing the field-average. Locations where the mean relative difference was below 0.02 m3 m−3 extended up to 10% of the field area whereas the intersection of areas showing the field-average within a tolerance of 0.02 m3 m−3 covered 5% of the field area. Compared to most of the previous studies about temporal stability of soil moisture, time-stable areas and their spatial patterns could be revealed instead of single point locations, owing to the advanced GPR method for real-time mapping. It is believed that determining spatially coherent time-stable areas is more informative rather than determining time-stable points. Other acquisitions over larger time periods would be necessary to assert the robustness of the time-stable areas.