Drought potential index using Normalized Difference Drought Index (NDDI) method based on Geographical Information System (GIS) in Slogohimo, Wonogiri Indonesia

Abstract

Climate change is an impact caused by global warming. The phenomenon due to climate change is El Nino, which affects a long dry season. Central Java is an area heavily affected by drought caused by El Nino, one of which is Wonogiri Regency, which has the potential to cause crop failures, forest fires, and decreased water availability, which can be detrimental. Drought potential analysis was carried out to estimate the distribution of the drought index in Slogohimo District, Wonogiri Regency. The method used is the Normalized Difference Drought Index (NDDI), which combines vegetation density and wetting level using Landsat imagery—the NDDI index transformation method on a scale ranging from very low to very high (severe). The results show that the distribution of drought potential in Slogohimo District, Wonogiri Regency, is classified as very low to very high class. Still, the broadest area is classified as low. The tendency for drought to occur in the Slogohimo area is spread from the east to the south. This research suggests the application of organic mulch for improvement to reduce the potential for drought. Apart from being an effort to modify soil temperature, organic mulch also functions as a soil conditioner, which impacts adding soil pores to increase water retention.