Japan Geoscience Union Meeting 2018

Presentation information

[EE] Poster

A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW20] Materials transport and nutrient cycles in watersheds; Human and climate impacts

Mon. May 21, 2018 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Mitsuyo Saito(Graduate School of Environmental and Life Science, Okayama University), Shin-ichi Onodera(Graduate School of Integrated and Arts Sciences, Hiroshima University), Takahiro Hosono(熊本大学大学院先導機構, 共同), Adina Paytan(University of California Santa Cruz)

[AHW20-P10] Estimation of water budget including deep groundwater discharge in small islands, using hourly resolution SWAT Model analysis

*Yang Cao1, Shin-ichi Onodera1, Fandy Tri Admajaya1, Yuta Shimizu2, Mitsuyo Saito3 (1.Graduate School of Integrate Arts and Sciences, Hiroshima University, 2.Western Region Agricultural Research Center, National Agriculture and Food Research Organization, 3.Graduate School of Environmental and Life Science, Okayama University)

Keywords:SWAT, island, hourly simulation, water budget, runoff

This study used hourly simulations in the SWAT model to research the water budget in small catchments on the Ikuchijima island. Satisfactory results were obtained for flow simulations in the small catchments using hourly precipitation data. The results show that R2 and NS both above 0.5 during the calibration and the validation period. And |PBIAS| is below 10 in the both cases. Based on this result, we found that SWAT hourly simulations performed well in rainstorms in small catchment areas and it successfully simulated the flood in this catchment during the simulation period. Therefore, it is considered that SWAT model hourly simulation is reliable in rainstorm and flood forecasting. This study also analyzed water balance components such as surface runoff, lateral flow, base flow and evaporation in this small catchment area, and the results were consistent with the actual conditions of the catchment such as climate, vegetation and geology.