| Abstrak/Abstract |
Watershed is a region inland that group on how the water flw, accumulate, and dischare based on its morphology. Every
watershed has its morphometric parameter, and it might affect the flod frequency or hazard in the region. One of the
parameters is the circularity ratio or Rc, the ratio of areas of a watershed and a circle with the same circumference/perimeter.
There has not been any research that tries to compare the Rc and flod hazard on multiple watersheds. Here we try to
calculate the Rc and flod hazard on multiple watersheds on the island of Java. The purpose is to fid any correlation
and pattern that can explain the rate of floding using geometric and morphometric characteristics of the watershed. The
watershed geometry is acquired from KLHK, and the flod hazard is generated from the Normalized Difference Flood
Index (NDFI) of multi-temporal Sentinel-1 SAR Imagery. The result shows there are two patterns of relationship found on
low (0 - 0.2) and high (0.6 - 0.8) Rc. These two groups show that higher Rc means a lower flod area but a higher flod
hazard score. This pattern does not show up in the middle-value groups of Rc (0.2 - 0.6). Using other flod data or regions
might show a different result. |
