Fig. 1

Geographical location of test area. The figure was drawn by ArcGIS10.8 (Esri China Information Technology Co. Ltd. http://my.ally.net.cn/index.php?c=com_index&m=yp&userid=10876).

Geographical location of test area. The figure was drawn by ArcGIS10.8 (Esri China Information Technology Co. Ltd. http://my.ally.net.cn/index.php?c=com_index&m=yp&userid=10876).