近30年北江下游河道演变遥感分析

利用近30年来的MSS、TM卫星影像和相关地区的相应1∶50 000地形图,通过卫星遥感技术、GPS定位技术,在建立遥感识别标志和影像特征的基础上,对北江下游河岸变迁、洲滩和河道演变进行了研究.结果表明,在1975~2001年间,北江下游河道具有明显演变过程,岸、滩冲淤变化明显,部分地区发生淤积.探讨了河道变化成因,提出控制河势为主的对策.

Riverway Evolvement Analysis in the Beijiang River from 1975 to 2001 by Romte Sense and Geography Information System

Environment of riverway is changed frequently by nature and human beings.And that is difficult to survery the environment with the general methods.in this paper,processing methods of remote sensed information and geography information system are offered and used to study the changes of the beijiang river.Some macroscopic,dynamic and quantitative results show that landscape of channel,banks and sandbars changed violently due to over-exploiting sand from 1975 to 2002.