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首页> 外文会议>ICECS 2010;International conference on environmental and computer science >A Method to Determine the Optimal Fixed Offset of Ground-Penetrating Radar for Estimating Soil Water Content in Field Measurement
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A Method to Determine the Optimal Fixed Offset of Ground-Penetrating Radar for Estimating Soil Water Content in Field Measurement

机译：确定野外测量土壤含水量的探地雷达最佳固定偏移量的方法

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摘要

In order to estimate soil water content by ground penetrating radar, an expenmental was conducted at Fukang Station of Desert Ecology of Chinese Academy of Science located in the southern part of Gurbantunggut desert_ Ground Penetrating Radar is used as the main data collection tool. Considering the higher accuracy of wide angle reflection refraction measurement and the faster speed of the fixed offset measurement of ground penetrating radar, a method is presented for the determination of optimal fixed offset based on the obtained average dielectric permittivity of the former. The result showed that: A decreasing trend for the average dielectric permitivity was found with increasing fixed offset of antennas Between 0.36-136m along survey line by fixed offset measurement According to the minimum deviating principle of the average dielectric permittivity,1.71 m was determined as the optimal fixed offset in the study, the ground wave of this fixed offset was picked and soil water content was calculated. and the average water content of 0.36-136 m along survey line is only higher 0.0016 m3/m3 than that of wide angle reflection refraction measurements, the accuracy can meet the actual demand, the average water content of the upper sandy showed spatial heterogeneity between 0-36.5 m along survey line, This method can accurately fast estimate mesoscale soil water content which can provide a scientific basis for agricultural production and crop irrigation.
机译：为了通过探地雷达估算土壤含水量，在古尔班通古特沙漠南部的中国科学院沙漠生态研究所阜康站进行了一次实验，以探地雷达作为主要数据收集工具。考虑到广角反射折射测量的较高精度和探地雷达固定偏移量测量的较快速度，提出了一种基于前者获得的平均介电常数确定最佳固定偏移量的方法。结果表明：通过固定偏移量测量，沿测量线的天线固定偏移量在0.36-136m之间时，平均介电常数的减小趋势。根据平均介电常数的最小偏差原理，将平均介电常数确定为1.71 m。在研究中的最佳固定偏移量下，拾取该固定偏移量的地波并计算土壤含水量。沿测线的平均含水量为0.36-136 m，仅比广角反射折光法测得的平均含水量高0.0016 m3 / m3，精度可以满足实际需求，上部砂质的平均含水量在0〜0之间表现出空间异质性。沿测量线-36.5 m，该方法可以准确快速地估算中尺度土壤含水量，为农业生产和农作物灌溉提供科学依据。

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