JpGU-AGU Joint Meeting 2017

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[JJ] Poster

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS30] [JJ] Ocean circulation, material cycle, and biological responsive dynamics in coastal seas

Sat. May 20, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Akihiko Morimoto(Center for Marine Environmental Studies, Ehime University), Kiyoshi Tanaka(University of Tokyo), Hideki FUKUDA(Coastal Conservation Section, International Coastal Research Center, The Atmosphere and Ocean Research Institute, The University of Tokyo), Haruko Kurihara(University of the Ryukyus)

[AOS30-P04] Monitoring for understanding marine condition in Wakasa Bay:Characteristics of seasonal variation in backscatter intensity measured by ADCP

*Atsushi Kaneda1, Yasuhiro Yoshikawa1, Kouta Ayukawa2 (1.Fukui Prefectural University, 2.Fukui Prefectural Fisheries Experimental Station)

Keywords:monitoring system, Wakasa Bay , Tsushima Warm Curernt

Wakasa bay is one of the bays facing the Japan Sea and its marine environment is strongly influenced by Tsushima Warm Current flowing near the shore. This area is known as a good fishing grounds for the set-net fishery and the trawl fishery. Recently, a monitoring system has been constructed to understand the fishing ground environment in Wakasa Bay. Water temperature, salinity and current are measured using moorings and real time buoys under this system, and the data collected by real time buoy are utilized for fishermen via web site. In this study, we focused on temporal variations of the backscatter intensity measured by an ADCP (Acoustic Doppler Current Profiler). To reveal the characteristics of variations, the ADCP data collected at a mooring point around the baymouth were analyzed. In addition, the characteristics of temporal variation of the backscatter intensity were compared with the temporal variation of physical and biological data such as water temperature, salinity, and fish catch. The data of water temperature and current collected by the monitoring system showed that the seasonal variation of the Tsushima Warm Current was closely related to the decrease of the backscatter intensity of the ADCP and the change of the fish catch in summer.