نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
The lack of proper management of water and soil resources, competition and increased demand in the use of water and soil resources, population growth and climate changes have caused the issues related to the change of uses and water resources to become one of the challenges of mankind in the last decade. Land use change has an effect on water storage in basins and is one of the main factors affecting the hydrological cycle. In this research, the effect of land use change on the flooding of Shahrokh Castle catchment basin as one of the sub-basins of Zayandeh Rood dam with an area of 1504 square kilometers in the period from 1999 to 2019 has been tried by preparing vegetation and land use maps and determining the area of each use and finally be evaluated by the equation of the United States Soil Protection Organization. Landsat satellite images were used for the four years of 1999, 2005, 2013 and 2019 in order to evaluate changes and prepare maps of land use and vegetation in the region. These images were processed and maximum likelihood classification was used to investigate the vegetation changes of the region from the NDVI index and to classify the images and prepare land use change maps, and the classification had acceptable accuracy. The results showed that between 1999 and 2019, the density of vegetation in the region decreased and had a decreasing trend. Also, the area of residential and road areas and barren land has increased, and the area of gardens, fields and water has decreased. In order to investigate the effect of land use change on the flooding of the region, the equation of the United States Soil Protection Organization was used. By using the average value of CN for different uses and based on the area of the uses, the average value of CN and surface maintenance coefficient (S) were obtained for different years. According to Table 4, the amount of precipitation was considered the same for all years (30 inches) and it was observed that the changes in the height of the runoff are very small and all are close to 23.4 inches, which is due to slight changes in land use in different years, but with Putting the actual annual precipitation in the equation, the flood changes were very noticeable, so that the height of the runoff varies between 24 and 69 inches in different years, which means that the rainfall has the biggest role on the flood in the basin, and the impact of land use changes in this area and in the period from 1999 to 2019 is very little.
کلیدواژهها English
rainfall variability impact on flood hydrology using a hydrological model in the Ethiopian river basin. Environmental Earth Sciences, 82(10), 254. https://doi.org/10.1007/s12665-023-10929-9
