Short-term variation of high-turbidity water discharged from a reservoir of reclaimed land onto Isahaya Bay, Kyushu, Japan

Komorita Tomohiro, Umehara Akira, Tai Akira, Takahashi Tohru, Tsutsumi Hiroaki

doi:10.5928/kaiyou.23.1_1

<p>We determined short-term variation of water discharged onto a bay system (Isahaya Bay, Japan) by conducting a high-resolution field survey at nine sampling stations from September 18 to 19, 2012. The amounts of suspended solids (SS) and particulate organic carbon (POC) discharged in water from the reservoir multiplied by the amount of discharge from the reservoir and the concentrations of both SS and POC in reservoir were estimated as 326 × 10⁶ and 3.3 × 10⁶ g, respectively. These discharge amounts accounted for only 16 % and 25 % of the change of the amount in front of the north gate. Thus, resuspension should occur for particulate matter from the reservoir sediment and/or from in front of the north gate. According to Stokesʼ Law, the main particle diameter should be less than 10µm for SS, and more than 10 µm for POC, respectively, on the basis of the time series variation for SS and POC. Three hours after the discharge, POC concentration in front of the north gate had declined at the same order as before the discharge; however, the POC in the reservoir accounted for a high proportion (from 80 % to 100 %) of the POC in front of the north gate. Part of the particulate organic matter from the reservoir must therefore flow out from Isahaya bay to Ariake Bay.</p>

Short-term variation of high-turbidity water discharged from a reservoir of reclaimed land onto Isahaya Bay, Kyushu, Japan

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