The restraint of geologic structure of river bed and bank on the rivers geologic action controls the river evolution trend.
河床河岸地质结构对河流地质作用的制约主导着河道演变的趋势。
Study indicates that the intensity, direction and magnitude of stress vary in different geologic periods. The stress values show a trend of increase from the old to young formations.
研究表明，不同地质时期应力强度不同，应力的方向和大小都有变化，认为应力值由老到新呈增大趋势。
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