Cleaner Sediments in Hiroshima Bay--A Trial Cleaning Project Using Sand Covering in Kure Inlet,
Abstract
In recent years, the quality of water and benthic sediments in many of Japan's enclosed bays has been deteriorating, partly because of the topography which results in infrequent replacement of bay water with fresh outside seawater, and partly because of the inflow of organic and other objectionable substances from inland areas. These conditions often cause serious problems in utilizing the bay as fishery grounds and in maintaining an environmentally sound bay. In the mid-1960's, strict regulations were enforced controlling the discharge of pollutants into the sea. At the same time sewage and waste treatment facilities were improved. Thus, the inflowing pollutant loads were reduced; however, this does not mean that bay water quality has been definitely improved because red tides are still reported very often. In view of this, the 3r4.District Port Construction Bureau, Ministry of Transport, set up a site to test the sand covering method. The test site is in Hiroshima Bay (which includes Kure Cove), one of the highly polluted enclosed bays. Sand covering is believed to be one of the best methods for achieving environmental improvement of sea areas. Its effects are being carefully studied in this experimental project. This paper introduces the outline of the experimental work implemented during 1979 and 1980 and its effects on cleaning the bay sediments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1992
- Accession Number
- ADP006901
Entities
People
- Hideaki Kakigawa
- Kanji Takemura
- Kenich Mizobata
- Satoru Shibata