鵜﨑賢一 1 ・小谷内秀幸 2 Ken-ichi UZAKI and Hideyuki KOYAUCHI 1 正会員 博(工) 群馬大学准教授 大学院理工学府環境創生部門 (〒376-8515 群馬県桐生市天神町1-5-1) 2 非会員 東京都庁 (〒163-8001 東京都新宿区西新宿2-8-1) It is important to develop the method to estimate the river discharge at rivermouth for the forecasting of sediment behavior in the nearshore zone. However, it is difficult to develop the method because of tidal effects. In this study, water elevation data H at the Minato-ohashi Bridge which is located at slightly upstream from rivermouth and

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... r discharge data q at the midstream of the Naka River, which are maintained to the Minato-ohashi Bridge, in the Tochigi and the Ibaraki prefectures in Japan. At the small q, H was linearly affected by the tidal elevation at Oarai η to the south of rivermouth. Then, tidal effects were removed from H data and the removed data with the time-rag consideration from the midstream to the Minato-ohashi Bridge were well shown by the function of root-q. Finaly, field observations by using the ADCP at rivermouth were conducted and q was corrected by using observation data. In conclusion, the equation of river discharge Q at rivermouth, H and ηwas obtained.