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Studies on the Subsoil Improvement of Sea Bottom Polder based on the Analysis of Salt and Ion Behavior in Clayay Soil

Research Project

Project/Area Number 60560248
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionOkayama University

Principal Investigator

AMAYA Takao  Faculty of Aqriculture, Okayama University, 農学部, 講師 (80033265)

Co-Investigator(Kenkyū-buntansha) MITSUNO Toru  Faculty of Aqriculture, Okayama University, 農学部, 教授 (10026453)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1986: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1985: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSea bottom polder / Gypsum dressing / Subsoil improvement / Cation exchange reaction / Physico-chemical properties of soil / 除塩
Research Abstract

The Fieid studies and laboratory experiments about a process of subsoil improvement after gypsum dressing into Kasaoka polder had been carried out. The results are as follows;
1. The field study showed the decrease of diffusion double layer and increase of free water because of the exchange reaction of adsorbed sodium ion by calcium ion supplied from gypsum. Consequently, the dispersion reaction in gypsum mixed layer had controled and soil changed to floculation state. At the same time, the improvement of soil physical characteristics had gained.
2. It was showed that the sedimentation volumes of soils was most adequate judgment standard for the improvement progress of sodium clay with gypsum.
3. The progressive situation of adsorbed sodium to calcium ion had been pursued and investigated from 1985 to 1986. The gypsum was scatterd and mixed until 50cm depth in the end of 1984 and its quantity was calculated from rational equation of cation exchange reaction considering spatial variance. Accordingly, the exchange had progressed smoothly and the subsoil improvement was remarkable. Furthermore, the long-term decline of salt concentration had become clear.

Report

(1 results)
  • 1986 Final Research Report Summary

URL: 

Published: 1987-03-31   Modified: 2016-04-21  

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