探地雷达在盐渍土地区盐磐层判断中的应用

The application of GPR in detecting the salt bed in saline soil area

准确判断盐渍土土层的分布状况对于盐渍土改良利用的方法技术选择十分重要,直接决定盐渍土改良的效果。针对新疆阿克陶地区盐渍化土地改良项目中坚硬盐磐层的判定问题,运用探地雷达对研究区土层进行探测,通过对雷达波谱影像图进行分析解释,推测盐磐层可能存在的位置。同时对研究区土层同时进行土壤紧实度和含盐量测定,对雷达分析结果进行验证。研究结果表明,探测区域内的T 10、T 31和T 69三个田块在深度约为30 cm处的雷达图像出现异常,判断该处可能存在盐磐层。通过土壤紧实度和含盐量的测定结果对这一结论进行了验证,表明探地雷达能够较好地判别盐磐层存在的位置,可在盐渍土土层分布状况探测中结合实地取土方法进行大面积应用。

In the process of improving and utilizing saline soil,it is very important to accurately determine the distribution of the saline soil layer,which directly determines the effect of salinized soil improvement.Aiming at the problem of determining hard salt bed in the salinized land improvement project in Akto area,Xinjiang,the ground penetrating radar was used to detect the soil layer in the study area.By analyzing and interpreting the radar image,the position of salt bed could be speculated.The soil tightness and saline content of soil layer in the study area were measured at the same time to verify the radar analysis results.Radar detection results show that there are abnormalities in the radar images of T10,T31 and T69 in the detection area at the depth of 30 cm,which can infer that there may be a salt bed layer.This conclusion is verified by the results of soil tightness and salt content.It shows that the ground penetrating radar has good effect in discriminating the existence of the salt bed layer.