河流阶地的形成、演变及环境效应

Formation and Evolution of River Terrace and Environment Responses

河流阶地是河流地貌演变的历史产物,它记录了河流演变过程中的有关环境变化信息,是剖析河流历史演变的关键地貌体。本文从河流阶地的地貌特征、形成原因、环境响应和有关测年技术等方面,比较全面地论述了河流阶地的发育、演变及其意义,并对相关问题进行了初步讨论。认为河流阶地是河流系统和环境综合作用的产物,对河流阶地的研究可以反演研究区地质构造、古河流动态及气候等信息,是揭示研究区环境信息的重要地貌单元。

As one of the consequences of historical fluvial evolution, river terrace has recorded some information about environmental changes during river processes. It is the significant geomorphologic complex for analyzing river＇s historical evolution. This work gives a review on the origin, geomorphologic characteristics, causes of formation, environment responses and the datemeasure technology of river terraces as well as its significance in reconstruction of environment during terrace formation. It shows that river terraces are the integrative consequence of the river system and related environment influences. Researchers should consider the entire river system and its environment syntheses to study river terraces. The geological tectonic and climate characteristics and ancient river dynamics may be revealed according to research of river terraces. River terraces are the crucial geomorphologic elements used to reveal the environmental information in study areas. With the development of the meterage instruments, the date-measure technology will be more accurate and sensitive. The dynamic simulation and the quantitative analysis for the formation and evolution of river terraces need more exploration.