A MAPPING OF CHANGES IN CORAL REEFS CONDITION BASED ON DEVELOPMENT THE MARINE ECOTOURISM IN THE SOUTHERN PART COAST OF PADANG CITY – INDONESIA

Abstract

This study aims to determine changes in the condition of coral reef ecosystems using satellite imagery. The research method used is the Geographic Information System (GIS) approach using Lyzengaalgorithm method with data of Landsat +ETM 7 in 1998, 2008 and Landsat OLI 8 in 2018. The results of this study indicate a decrease in the extent of coral reef conditions in 1998-2008 occurs in live coral cover covering 106.60 ha and the addition of area occurred in dead coral cover covering 147.97 ha. While the decrease of coral reefs condition in 2008-2018 occurs in dead coral cover covering 29.66 ha and the addition of area occurred in live coral cover covering 112.29 ha. Coral mortality index in Nirwana beach with an average 62.28 %, meaning very large coral deaths in this region. Coral mortality index in Cindakir estuary with an average 46.60 %, meaning quite large coral deaths in this region so that coral reefs need to be rehabilitated in these waters, which can be done in form of artificial coral transplants. The coral mortality index in Muara Dua bay average 39 %, meaning that coral mortality is quite large in this region, while the coral mortality index in Ujung Siboko bay average 44.65 %, this means quite a large number of coral deaths in this region, but this location has a very good soft coral and it is necessary to rehabilitate corals in these waters with the form of artificial coral transplants.