Author(s): Ryosuke Yoshimura; Yuki Ogata; Takehiko Ito; Riku Kubota; Yasuo Nihei

Linked Author(s): Yasuo Nihei

Keywords: Paddy field dam; Lake Inba-numa; River basin disaster resilience and sustainability by all; Flooding

Abstract: In recent years, heavy rainfall disasters have occurred in many parts of Japan every year. In response to these severe flood disaster, Ministry of Land Infrastructure, Transport and Tourism (MLIT) in Japan has established a Japan's new policy on water-related disaster risk reduction, called “River basin disaster resilience and sustainability by all”. One of the countermeasures in this policy is a paddy field dam, which promote the storage effect of rice paddies. This study aims to examine mitigation effect of the paddy field dam whole the basin in the Kashima and Takasaki Rivers, which are the inflow rivers in the Lake Inba-numa, Japan. For this, we conducted field surveys and flooding simulation. Field measurements revealed that the inundation area in the Kashima and Takasaki Rivers appeared mainly in paddy fields. It was also shown that the method of adjusting the direction and height of the drainpipe, which is the most common drainage method, is effective as an improvement method for paddy field dam. The introduction of the paddy field dam was confirmed to be effective in further reduction of flood discharge and flooding area.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p1056-cd

Year: 2023