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To grasp the phosphorus budget in Lake Teganuma, we have performed the field observations and numerical computation of water quality in summer in 2003 and 2004. The observed results indicated that the COD and T-P increased in the longitudinal direction in the lake, while the T-N decreased in the same direction. It is also found that the COD and T-P in 2004 were much larger than those in 2003. From the computational results, the higher value of the phosphorus in 2004 was mainly caused by the increase of the phosphorus release from the bottom in the lake. The phosphorus budget analysis illustrates that the phosphorus releases in 2003 and 2004 were comparable with those before the beginning of the environmental improvement project using the North-Chiba water conveyance channel.

STUDY ON PHOSPHORUS BUDGET OF LAKE TEGANUMA IN SUMMER WITH FIELD OBSERVATIONS AND NUMERICAL COMPUTATION