Analysis of Morphometric Changes in Tondano Lake Based on Bathymetric Maps

Abstract

This study aims to analyze changes in the morphometry of the lake bottom in a period of ten years, namely from 2006 to 2016. The analysis of morphometric changes is carried out by comparing two bathymetric maps from the mapping in 2006 and 2016. The morphometric aspects studied include the water surface area stated in km2, the volume of water (in m3) and the depth of the lake (in m). The results showed that within 10 years the surface of the lake water has decreased by 1.03 km2, while the total volume of lake water has increased by 10.41 m3. The average depth of the lake in a period of 10 years has barely changed significantly, only silting of about 0.01 meters. Judging from the contour pattern, it shows that there is a tendency for siltation to move not only towards the south but also towards the east. That means more sediment contributions come from the western region. The rain catchment area on the west side of the lake has a larger area when compared to the east side (Eris District). The sediment potential is greater from this area.