Analysis of Glacial Deposits Instability in Zab Kouchak Basin

Abstract Glacial activity has been existed in Zab Kouchak river Basin especially in western and northern highlands during glacial periods and works digging of the glaciers are remained as circus and glacial valleys. Other glaciers works in the basin are being deposited glacial sediments on the slopes and river beds which causing mass movements. In the research was determined domain of glacial deposite by using Topographical maps 1:50000, Radar data of Aster Sensor, LISS III and Pancromatic images of IRS Satelitte and climatic data during 1365-1387. Weighted Sum analyst was carried out in order to determine zones of instability in Zab Kouchak Basin, because of using different variables, compared their and also coefficients are presented for each of the variables. The result showed that there is high unstable in Zab Kouchak Basin. High and very high unstable domains are conformity with slopes of cirques and valleys end to cirques. Also the terraces on the edge of river valleys are unstable. Especially the terraces remained at altitude of 1600 meters in Silveh village and Zivkeh and Mashkan villages near the upstream which is formed glacial deposits are the most unstable parts of the area. Fans and terraces of this river basin were exposure drastic changes. The nature of the glacial deposits and irritability of their through human economic activities have created hazardous conditions, so that Land on the terraces are affected by landslides. Several falls has occurred in valleys of the edge roads which during rainfall to dam front of water and with material and a sudden flood waters can threaten roads and bridges. Fish breeding centers and rural settlements along the river and on the loose glacial deposits are at risk of land instability