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Title :温度変化と潮汐差によって引き起こされる干潟内部の間隙水流動
Title alternative :BEHAVIOR OF PORE WATER IN THE TIDAL FLAT INDUCED BY TEMPERATURE AND TIDAL EFFECT
Authors :エムディ アジズル モクスド
Authors alternative :MD. AZIZUL MOQSUD
Issue Date :2007
Abstract :This study aims to assess the pore water movement in the tidal flat induced by tidal and thermal environment in the shallow sea. The pore water movement occurs in the tidal flat area due to the tidal effects and the presence of the biogenic gas in the tidal mud. The time lag to reach peak pore water pressure in the tidal flat area causes some upward and downward movement of the pore water during flood tide and the ebb tide. The diurnal and seasonal variation of temperature in the tidal flat area causes a movement of pore water at different depths. A correlation is developed for the temperature profile with depth in the muddy tidal flat area. The temperature distribution in the tidal mud area shows a great variation from winter to summer. The uppermost region of the tidal flat mud is largely influenced by the solar radiation. But in the deeper part, the temperature is influenced by the thermal properties of the mud, more specifically, the volumetric heat capacity of the mud.The thermal properties of the mud of the acid contaminated Ariake Sea was investigated through laboratory studies. The thermal properties of mud collected from tidal flat showed a different trend from the mud collected from under the sea due to its exposure to sunlight and the tidal wave turbulation. Thermal diffusivity does not change at all in the deep sea mud samples which typical value of 0.12 mm2/sec in all seasons. ThThe sulphide content showed peak values at the same depth where the volumetric heat capacity showed similar peak values as the sulphate reducing bacteria prosper in the layer where the volumetric heat capacity is higher. The higher volumetric heat capacity region is more stable condition which is conducive to the sulphate reducing bacteria. A modification is proposed for the sulphide content-depth distribution relationship which is primarily proposed by the Jorgensen and Sorensen. The geoenvironmental condition of the Ariake Sea has been deteriorated due to the acid treatment practice for the sea laver cultivators. The
Type Local :博士論文
URI :http://portal.dl.saga-u.ac.jp/handle/123456789/55391
Appears in Collections:Doctor Thesis

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