Monitoring the sinkholes of KaboudarAhang city of Hamedan using radar interferometry technique

Land subsidence due to uncontrolled extraction of groundwater resources is one of the events that has been observed in abundance in Iran. Due to the improper extraction of groundwater resources in the country, unfortunately, . Kabudrahangplain of Hamedan is the richest plain of Hamedan province in terms of having groundwater resources, but unfortunately in the last 30 years due to excessive abstraction of groundwater to meet agricultural and industrial needs and lack of adequate monitoring of this issue, Groundwater level has decreased, which has caused subsidence and, of course, sinkholes in Kabudrahang city. The purpose of this study is to identify sinkholes to prevent or reduce the damage caused by it.In this research, the radar interference method with the help of SENTINEL-1 satellite radar images using SNAP software has been used to monitor subsidence and subsidence, and the subsidence rate and the number of subsidence have been reported.After reviewing the approximately quarterly periods of the study area using the image of the first period and the last period to a period of 361 days, i.e. the images of 09/15/2017 to 10/09/2018 in the study area in general was examined. The results of this study show that in the period of one year, the study area has subsided by 14.5 cm, which is more subsidence in Kordabad, Noabad, KaboudarAhang, Famenin and in general in Fameninplain,Kabudrahang, Qahvand and around Hamedan has happened. These results can indicate the danger of landslides in these areas.The final results show a total subsidence of about 14.5 cm in the range that most of these subsidence occurred around urban areas and close to residential areas that this factor can be a news of occurrence. To bring about imminent human catastrophes in Hamedan province, especially KaboudarAhang plain.