青藏高原札达地区多年冻土遥感技术圈定方法与应用

Remote sensing technology delineation method and its application to permafrost of Zhada area in the Tibetan Plateau

为了更好地了解青藏高原札达地区多年冻土的分布情况,归纳总结了冻土下限的遥感解译标志;利用不同类型的遥感数据源对冻土的下限位置进行了圈定,并分别与高程模型和温度模型的圈定结果进行了对比。结果表明:该区多年冻土区面积为17 148.93 km2;3种模型相互补充参考,可以提高大比例尺多年冻土制图精度,此方法应用结果在区域上作为参考资料前期使用,可大大缩小相关项目前期工作量,提高效率;因此,利用遥感技术圈定多年冻土的应用价值较高,可以更好地为青藏高原区域地质、水文地质、工程地质及气候变化等研究提供更加详实的资料。

In order to obtain a better understanding of the spatial distribution of permafrost in Zhada area of the Tibetan Plateau, the authors used different remote sensing models to delineate the depth of permafrost and employed elevation model and temperature model to compare the results. According to the result, the study area covers 17 148.93 km2. The authors summarized the interpretation signs for the depth of permafrost in this area. A comparative study of the 3 models can improve the mapping accuracy for the large scale permafrost, greatly reduce related project preceding work and improve efficiency. It is concluded that the application value of the remote sensing technology delineation method is high. Therefore, the remote sensing technology delineation method is very useful in such fields as regional hydrogeology, engineering geology and climate change in the Tibetan Plateau.