The packing efficiency decreases with the increase of gravel concentration in injected liquid, fluid loss to formation and gravel size.
充填效率随携砂液中砾石浓度、滤失量及砾石直径的增加而降低。
The cool, clear waters with loose gravel beds hold some 2, 000 bull trout nests, among the highest concentration in the world.
凉爽清澈的河水，还有松散的碎石河床拥有2000外欧鳟巢穴，是世界上欧鳟巢穴最密集的地方。
The water surface level, velocity field and sediment concentration field of gravel sand bed and sand bed reach on Jianjiang river were refined simulated.
细致地模拟了荆江卵石夹沙河床及沙质河床浅滩河段的水面线、流速场、含沙量浓度场及河床变形。
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