Urban development and the characteristics of short and medium-term hydrological drought in the Samian watershed of Ardabil province
Subject Areas :
Saeed Rasinezami
1
(Associate Professor, Department of Civil Engineering, University of Mohaghegh Ardabili)
hadi izadifard
2
(M.Sc in Civil Engineering, Water Resources and Environment University of Mohaghegh Ardabili)
Raoof Mostafazadeh
3
(Associate Professor, Dept. of Natural Resources and member of Water Management Research Center, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili)
Hassan Khavarian
4
(Assist Prof., Faculty of Social Sciences)
Keywords: Hydrological Drought, SDI Index, DrinC software, Samian Watershed,
Abstract :
Hydrological drought is affected by many factors and is quantified using SDI index. The purpose of this research is to evaluate the urban development with satellite images between 1992 and 2016 and to evaluate its effect on the characteristics of hydrological drought events in the Samian area of Ardabil province. Land use change assessment shows that the agricultural and residential areas have been increased. Examination of the one-month SDI index in all stations shows an increase in droughts in different periods. The highest number of dry months is related to the last period (2017-2008) of Samian station for 80 months. The highest increase in the number of dry months is related to Gilande station, which has increased from 1 month in the first period to 66 months in the last period. The study of the quarterly SDI index in all stations except Atashghah station shows the increase of drought in different periods. The highest increase in the number of dry quarters is related to Gilande station, which has increased from zero in the first period to 36 in the last period. Despite the increase in rainfall during the period and the presence of wet climatic months, as well as the relative increase in temperature in the region and due to increased agricultural use and residential areas that have increased the harvest of surface water, the number of dry months in the region has increased.