THE TECTONIC REJUVENATION IN JENEBERANG WATERSHED, SOUTH SULAWESI

Jeneberang watershed is located in the southern part of Sulawesi???s south arm. It covers the regencies of Gowa, Takalar, Maros and the city of Makassar. Jeneberang River has caused acute floodings in the coastal plain of Makassar. The flood is not merely due to the water debit but mostly related to the large amount of transported materials. To protect the worsening of the flood a series of debris control or sabo dams were built along Jeneberang River. However, the dams are quickly filled with the materials due to the intensive erosion and slumping.\ud The present study aims to reveal the cause of land and rock movements at the upper part of Jeneberang watershed. The morphometric analysis using satellite imageries and the measurement of morphologic elements such as river gradient, bifurcation ratio, river density, high-low ratio of the valley, sinuosity indices and river offset were carried out. The results show that active tectonics intensively takes place in the upper part of Jeneberang watershed. The rock slumping recently occurred in Bawakaraeng was one of the evidences of the tectonic rejuvenation (neotectonics) in the southern part of Sulawesi???s south arm