The mechanism and rate of re-sedimentation of phosphorus released from the sediment during the summer months in shallow brackish lakes

Abstract

Water, salt and phosphorus balance of the 19 years was calculated in Lake Shinji, a shallow brackish lake in Japan. Average annual freshwater inflow of 19 years into Lake Shinji was in the range of the 1.25 ～ 2.35 × 10 9 m 3 , the average was 1.77 × 10 9 m 3 . Reverse flow from the Lake Nakaumi located downstream of the Lake Shinji was in the range of 0.32 ～ 0.84 × 10 9 m 3 , the average was 0.49 × 10 9 m 3 , corresponding to 27.7% of the freshwater inflow. Retention time in consideration of the amount of freshwater inflow and reverse flow from the Lake Nakaumi were from