Because it destroyed the river equilibrium, sand excavation would cause river bed erosion in large scale, which is danger our to the structure across the river.
由于采沙破坏了天然河床的平衡状态，可引起长距离河床整体下切，对已有跨河桥梁工程不利。
Bed planting improves soil fertility and structure and helps reduce erosion, water usage, herbicide use and facilitates mechanical and manual weeding.
垄播改善了土壤肥力和结构，对减少流失、水的利用和除草剂的施用也有帮助，也方便了机械和人工除草。
Bed planting and water management in the Yellow River: Serious water and soil erosion in the Yellow River has led to frequent basin-wide drought and floods.
黄河流域的垄播和水管理：黄河流域严重的水土流失导致整个流域经常发生水旱灾害。
With the snow-draped Sierra Nevada as a backdrop, unique erosion formations called sand tufa stand like giant cauliflower stalks in a dry Arizona lake bed.
伴随白雪披上内华达山脉作背景，独特的侵蚀构成沙石灰华站在像巨大的花椰菜秸秆在亚利桑那州的干燥的湖床。
Sierra Nevada as a backdrop, unique erosion formations called sand tufa stand like giant cauliflower stalks in a dry Arizona lake bed.
伴随白雪披上内华达山脉作背景，独特的侵蚀构成沙石灰华站在像巨大的花椰菜秸秆在亚利桑那州的干燥的湖床。
Weathering of rocks in the mountainous area and gravitational erosion also play important part in contributing to the bed load which easily deposits.
此外，山区基岩风化与重力侵蚀也产生大量的推移质沉积物。
It gathers up the present results on reasonable studies, and shows objectively the fundamental rules on erosion of horizontal tube immersed in fluidized bed.
该模型综合了目前较为合理的研究成果，客观地反映了鼓泡床中埋管磨损的基本规律。
It is assumed that there is an "effective bed velocity" on the bottom which determines the erosion and deposition of the bed.
说明底部有一个“作用流速”，才产生底床的冲刷与淤积。
Computation of erosion and deposition on the bed surface is a foundation of predicting bed variations in rivers, estuaries and seas.
冲淤计算是河流、河口、海岸等水域中分析、预测床面变化的基础。
The erosion of cohesive bed is simulated;
模拟了粘性土河床的冲刷特性；
The erosion of cohesive bed is simulated;
模拟了粘性土河床的冲刷特性；
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