泥沙密度是河流泥沙的主要物理特性之一。
Sediment density is one of main physical characteristics of river sediment.
省内入湖四水泥沙含量低，洲滩优势植被为莎草、柳林，家畜活动数量多，感染螺密度高。
Many domestic animals are herded there and the density of infected snails is high.
建立三维湍流模型，在水流控制方程中加入植被阻力项和植被密度项来考虑刚性植物对水动力特性和泥沙输运特性的影响。
This paper proposes a 3d turbulence model, introducing vegetation density and drag force to the control equations of water flow with vegetation.
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