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摘要
Nowadays, river dynamics is strongly influenced by human activities. The Zarrin,-RA << d River morphology and the Urmia Lake beach line have been changing in recent decades because of agricultural and construction activities, industrial and urban projects, extra using of water, and sediments of river by riverside dwellers. Remote sensing and geographical information system (GIS) are used in this research for detecting and monitoring of these changes. The modified normalized difference water index (MNDWI) was applied for detecting surface water information from Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) images of the Zarrin,-RA << d River. And then, Linear Directional Mean (LDM) algorithm was applied for morphological change analysis of the Zarrin,-RA << d River on the GIS platform. The results showed that applying the methods of MNDWI algorithm and LDM is useful and efficient for determining the boundary and analyzing the morphologic characteristics of the Zarrin,-RA << d River from 1985 to 2011. Broadly, the results indicated that the number of changes has dramatically increased. So as to analyze the changes of the Zarrin,-RA << d River course more carefully, it was divided into five sections. The change in each section can be demonstrated as follows: section one, a gradual change from a meandering pattern to braided pattern; section two with meandering pattern, minor changes during the research period; section three with meandering pattern, the smallest amount of change in regard to the length of the sections; section four with meandering pattern, the most significant changes along the river; section five, keeping the straight pattern. The outcomes of this paper can be utilized to ameliorate the water management and sustainable development.
- 出版日期2015-10
