Accession Number:

ADP006910

Title:

Gas Generation in Canals of Tokyo Port,

Descriptive Note:

Corporate Author:

BUREAU OF PORTS AND HARBORS TOKYO (JAPAN) DEPT OF CONSTRUCTION

Personal Author(s):

Report Date:

1992-04-01

Pagination or Media Count:

16.0

Abstract:

Gas generation in canals of the Tokyo port has been studied to identify its mechanism. The major component of generated gas is hydrogen sulfide. Gas emissions from sediment into water are closely related to the depth of water and tide. Emissions per half days were 4 to 11 1m2 for the 1-m depth of water or less and 1m2 for water more than 2 m depth. Emission of gas into water began during the ebb tide, indicated maximum value about 1 hr before low tide, reduced during the flood tide, and became almost zero after high tide. According to seasonal variations of generated gas, emissions are greatest in August, being over 100 times more than those in October. Gas emissions are suppressed significantly by sediment dredging gas emissions measured after dredging were reduced to 1300 to 1200 of those measured before dredging. The concentration of hydrogen sulfide was attenuated by water at a rate of 13 per meter. Generally, the relationship between sediment thickness and gas emissions was not clearly determined.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Inorganic Chemistry
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE