Accession Number : ADP006461

Title :   Influence of Anoxic Water in Tokyo Bay and Its Management Planning,

Corporate Author : MINISTRY OF TRANSPORT YOKOHAMA (JAPAN)

Personal Author(s) : Iwakami, J. ; Fuse, H. ; Matsui, H.

Report Date : MAR 1992

Pagination or Media Count : 22

Abstract : Recently, upwelling of anoxic water, called Aoshio, has been frequently found in the inner part of Tokyo Bay. As the occurrence of Aoshio causes shellfish to perish, the study of Aoshio is very important to maintain the natural environment. In this paper, the analysis of Aoshio on basis of past data and field studies in 1987 is presented with a simulation model for Aoshio occurrence. Principal results are as follows: (a) The occurrences of Aoshio are most frequently found from July to September and near the cost of Funabashi. (b) The mechanism of Aoshio occurrences is mainly due to coastal upwelling effect of anoxic water mass near bottom through northern wind duration in summer. (c) Simulation model studies for Aoshio have modeled the actual phenomenon in the field, such as in 1987. (d) Dredging and capping are the most effective ways to diminish Aoshio occurrence.

Descriptors :   *CAPPING, *DREDGING, BAYS, BOTTOM, COSTS, ENVIRONMENTS, SHELLFISH, SIMULATION, SUMMER, UPWELLING, WATER.

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE