Shoreline Evolution and Mangrove Landscape Transition in Probolinggo, East Java, Indonesia

摘要

Northern coast of Java represents a region with dynamic shoreline, caused by large-scale conversion of mangrove and intense coastal development. Since 2000s, several mangrove rehabilitation activities have been carried out in Probolinggo, aimed to restore habitat as well as prevent coastal erosion. The purpose of this study was to analyze temporal mangrove evolution in western Probolinggo, in correlation with shoreline change. A series of temporal Landsat satellite represents an overview of four decades mangrove evolution along the coastline of western Probolinggo, while 34 sampling plots were carried out for mangrove groundcheck during 2018 - 2020, completed with UAV orthoimages from selected locations. Result showed that over the past four decades (1978 - 2020), mangroves in Tongas and Sumberasih experienced depreciation of 16 ha and 106 ha respectively. Most of mangrove area were converted for agricultural and aquaculture activities. River mouth areas with mangroves tend to prograde, with growth of the coastline reaching 600 m seawards and accretion rate of up to 17 m/yr, while exposed areas tend to erode. Less successful mangrove rehabilitation activities occurred on exposed coastal areas with no natural mangrove vegetation over decades. These results can be used as consideration for sustainable mangrove management.