Author(s): Maya Amalia Achyadi; Koichiro Ohgushi; Toshihiro Morita
Linked Author(s): Koichiro Ohgushi
Keywords: Climate change; Tidal irrigation; Barito; Terantang; MIKE 11
Abstract: Climate change is a highly serious problem on agricultural sector and potential new problems sustainability of food production. Climate change will generate a hazard on alteration of rainfall patterns, sea water level rise and increasing of temperature. Phenomenon of climate change in Indonesia indicated by an impact on water availability. Tidal irrigation is an irrigation system that is widely used by farmers in Indonesia such as Terantang Irrigation unit. Tidal irrigation is a different system from other irrigation systems, it takes the advantages of ocean tides and push the river fresh water to the primary canal on the irrigation network. Terantang unit is highly dependent on the water level of Barito River as a source of water supply in addition to the rainfall. Projected rainfall during the 2050s and 2090s are obtained from two circulated models for projected temperature and rainfall data under CMIP5 with 4.5 and 8.5 RCPs scenario. Based on the future effective rainfall water requirement is estimated. The requirement for irrigation water is not only sufficient discharge, but also the appropriate water level. This research developed a MIKE 11 model of an existing canal network to simulate the impact of rising sea level elevation. Model prediction indicates that sea level rise impact the water level requirement of paddy fields.
Year: 2020