基于雷达遥感的“吉兰泰-河套”地区古水系演化研究

The "Jilantai-Hetao" region is covered by this research lies across a critical climatic boundary Quaternary lacustrine sediments and its sensitive response to climate change due to its location have attracted much research interests here. The evolution paleodrainage system of Poleo-Megalake 'Jilantai-Hetao' closely related to the evolution of Yellow River,the desert evolution and environmental change. The research of evolution of paleodrainage system unable to continue in depth， because the absence of effective use of new technologies. This project uses the long-wave radar remote sensing images(ALOS/PALSAR), combined with ground-penetrating radar data to identify the region's paleodrainage, collecting the samples of paleo fluvial geomorphology to determine the time of its existence, Combined with DEM data and the geological structure to reproduce the temporal and spatial process of evolution of the paleodrainage system.

吉兰泰-河套古大湖位于季风区与西风区过渡带，生态环境极其脆弱，对环境变化极为敏感，是研究气候、环境变化的理想场所。吉兰泰-河套古大湖的环境变化过程与其水系的演化密切相关，吉兰泰-河套古大湖地区的湖泊水系演化研究，由于未有效的利用新的技术手段，未能继续深入下去。本项目利用长波雷达遥感影像，结合探地雷达数据，对该地区的古河道进行识别，采集样本，确定其存在时间。结合DEM数据和地质构造信息，重现该地区古水系演化的时空过程。

利用ALOS／Palsar L波段数据、SRTM-3数据和Google-Earth软件研究了石羊河是否外流并补给‘吉兰泰-河套’古湖的问题。研究表明石羊河的终端白碱湖有可能曾经和雅布赖山前盆地是一个统一的古湖，并外流入和屯盐池，从和屯盐池通过一条古河道与吉兰泰盐池联系起来。