Abstract
Field observation of heat and salinity on/in sand bar by using buried data-loggers was carried out in the Yasaka river mouth in Oita Prefecture in order to obtain environmental data of spawning ground of horseshoe crab Tachypleus tridentatus. Temporal changes in salinity and temperature on the surface and 15cm below the ground level have been measured at 20 minutes intervals since July, 1997. During the observation, large flood occurred on September 16 due to heavy rainfall of Typhoon 9719 and sand bar was partly eroded out due to flood flow. During this flood rapid decrease in underground temperature as well as rapid change in salinity was measured due to the exposure of the apparatus to the surface. Exact erosion time was observed, implying that this method can be applied to the observation of disintegration process of river mouth bar due to flood flow.
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