[A-HW27] Biodiversity, nutrients and other materials in ecosystems from headwaters to coasts

[AHW27-21] Hydrological Modeling of a Creek Field Region for Agricultural Water Management in the Yabe River Catchment

*Nang Yu War¹, Shin-ichi Onodera¹, Kunyang Wang¹, Mitsuyo Saito¹ (1.Hiroshima University)

Keywords:water resource management, irrigation, SWAT model, Yabe River

Understanding the hydrological processes within creek-dense watersheds is essential for managing water resources effectively in agricultural areas. This study applies the Soil and Water Assessment Tool (SWAT) to model the impacts of irrigation practices on water resource dynamics in the Yabe River catchment, a heavily creeked watershed in Fukuoka, Japan. The region’s intricate network of artificial creeks plays an important role in irrigation, drainage, and water retention, necessitating a comprehensive modeling approach. The study uses land use, soil properties, and meteorological data to simulate hydrological processes and assess streamflow. Calibration and validation at Funagoya station utilize long-term observational data of daily streamflow (2007–2022). A key challenge is the sparse distribution of weather stations, addressed through data generation techniques and alternative PET estimation methods. Preliminary results highlight the significant influence of irrigation practices on water availability and management within the creek network. The findings contribute to optimizing water resource management strategies for sustainable agricultural development in creek field regions.


Acknowledgement
This study is supported by the Forestry Agency of Japan.