A DERIVATION OF MATRIC POTENTIAL IN FROZEN SOIL
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概要
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Matric potential in frozen soil is derived from equilibrium between unfrozen water and ice in frozen saline soil. The matric potential in frozen soil, expressed here in pressure unit, is approximately expressed as a linear function of temperature, ice pressure and osmotic pressure, of which coefficients are 1.23 (MPa/℃), 1.1 and 1.0, respectively. The direction of water movement is determined by a sign of the difference in the sum of matric plus gravitational potentials between frozen and unfrozen regions. It is predicted from the derived equation that heaving pressure is proportional to freezing temperature. anddecreases with increasing solute concentration.塩分を含む凍土のマトリックポテンシャルを不凍水と氷の平衡から誘導した。圧力単位で表示した凍土のマトリックポテンシャルは近似的に温度，氷圧および浸透圧の線形和で表現される。このとき，それぞれの係数は1.23（MPa/℃），1.1および1.0である。土の凍結過程の水分移動の方向はマトリックと重力ポテンシャル和の凍結部および未凍結部の差の符号によって決定される。本論文の誘導式から，凍上圧は凍結温度に比例し溶質濃度が増加すると減少することが予測できる。
- 1993-03-26
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