ارزیابی اثر خشکسالی، تغییرات اقلیم و تخریب مراتع و جنگل‌ها بر وضعیت پیوستگی رسوب حوزه آبخیز

Drought, climate change, and the destruction of pastures and forests always have a great impact on the hydrological conditions of the watershed and related processes. Vegetation is one of the important characteristics of the watershed, which, in addition to its high sensitivity to climate changes and droughts, is examined in studies related to the evaluation of the watershed and the investigation of geomorphological and hydrological processes. In this research, the effect of droughts and climate changes on the continuity of watershed sediment was investigated. The main effect of droughts and climate change is related to the establishment and growth of vegetation in the watershed. Vegetation reduces the runoff coefficient, reduces splash, sheet,, rill, gully, and bank erosions, and reduces sediment, and any threat to vegetation will lead to these processes. According to research conducted in different countries, droughts cause the loss of vegetation, which creates the conditions for the formation of runoff and soil erosion. In post-drought conditions, heavy and intense rains related to climate change easily turn into runoff, and the rate of soil erosion and sediment production increases greatly. Therefore, based on the analytical summary of the findings of various research, the continuity of watershed sediment in the conditions of drought and climate change, as well as the destruction of pastures and forests due to human activities and improper management, will increase significantly.