Determination of Soil Loss Based on the TanDEM-X12m. Digital Elevation Model


Avcioglu A., Bayrakdar C., Sari E., Kaya T. N. A.

JOURNAL OF GEOGRAPHY-COGRAFYA DERGISI, no.41, pp.93-107, 2020 (Journal Indexed in ESCI) identifier

  • Publication Type: Article / Article
  • Volume: Issue: 41
  • Publication Date: 2020
  • Doi Number: 10.26650/jgeog2020-0047
  • Title of Journal : JOURNAL OF GEOGRAPHY-COGRAFYA DERGISI
  • Page Numbers: pp.93-107

Abstract

Soil is one of the most important natural resources in the world. Determination of soil degradation has been widely attempted all over the world in the last 50 years. This study provides a perspective of comparing the digital elevation model (DEM) in terms of the Revised Universal Soil Loss Equation (RUSLE) model, which calculates soil loss in Mountain Karadag - Akcay Basin. RUSLE comprises the topographic (LS), climatic (R), vegetation (C), soil (K), and support practice (P) parameters. To evaluate soil loss in the Akcay Basin, TanDEM-X12m. DEM was used and compared with ALOS12.5m and SRTM30m. DEM. Distribution of soil loss has a positive correlation with slope degree (R-2 = 0.62) and rainfall and runoff factor (R). As the elevation increases in the short range (15 km) from south to north in Akcay Basin, the rainfall and runoff increase together with elevation. The tributaries of the trunk river (Akcay) were characterized by a narrow and incised V-shaped valley, and this gave rise to increase in the LS factor in the short range. This phenomenon shows that the LS factor is one of the most important factors with regard to triggering factors. According to the TanDEM-X12m-based DEM, the mean annual soil loss is 28 ton ha(-1) ya(-1) from the basin.