Geomorphic Assessment of in-Channel Sand Excavation on the River Meric, Turkey

Abstract

In-channel sand excavation has been implemented on the River Merlc flowing through Turkey for the last 15 years to prevent or mitigate floods and to generate income. Sand removal was carried out by digging in-riverbed sand deposits in the 12 km section of the river running alongside the city of Edirne. This study aimed to investigate the geomorphological effects of in-channel sand excavation on the River Meric in the Edirne province and to evaluate the results.The 12 km section of the River Meric in the Edirne province was examined between 2008 and 2019.The braided channel pattern of this part of the river was mapped for a one-year period. Annual variation characteristics were determined using GIS and RS. Flow observations and change characteristics in the river channel morphology were then correlated. Changing the natural river channel form and channel cross-sectional characteristics of the river has led to changes in river erosion and deposition. It is predicted that these changes will play a triggering role in causing unexpected fluvial geomorphology problems. We suggest that the expected economic input for river sand mining should be re-evaluated from the perspective of cost-benefit analysis.