bed erosion 中文意思是什麼
bed erosion
解釋
河床沖刷-
Effect of water and sediment variation on erosion and deposition of weihe river bed
渭河水沙條件變化對河床沖淤的影響分析 -
What ' s more, we put forward some experienced formulas on the basis of the cortical analysis. the result of the research show that by installing diffluent piers with low ridge, we can eliminate the root of oscillatiny water jump, perfect the energy dissipation effect of water jump, also, we can improve the flow condition of down - stream. the fact that the main flow of down - stream is in the middle, not only effectively lower the speed of the bottom flow in the ridge rear, alleviate the erosion to the river bed, but also avoid the heavy wave resulted from the main flow in the surface, thus improve the surface wave of down - stream obviously. we can work out the body style parameters of diffluent piers with low ridge according to the project flow condition and experience formulas, and then reckon the down - stream surface wave condition for the protected building of the down - stream bank
研究結果表明：設置低坎分流墩后，消除了擺動水躍水舌擺動的根源，提高了水躍的消能效果，改善了下游水流流態。下游水體的主流在中部，既有效的降低了坎后水流底流速，減輕水流對河床的沖刷，又避免了主流位於表面導致波浪過大的結果，下游的水面波浪明顯得到削減。依據經驗公式，可根據工程水流條件設計出低坎分流墩的體型參數，進而估算出下游沿程的水面波浪，為下游岸邊的砌護提供依據。 -
When erosion ceased, the bed surface was observed to be covered by a thin layer of sticky material.
當沖刷停止時可以觀察到床面上覆蓋著一薄層粘著物質。 -
The effect of lateral boundary condition, the river regime and the bed material on lateral erosion are analyzed
結果表明：水庫下游均會有河岸侵蝕發生，但初期一般以下切為主，後期以展寬為主。 -
The results show that ( 1 ) the system of contour dams, contours and fallow had positive impact on water and soil losses than grass stripes and contour ditch. at the same time it was showed that contour dams, contours, fallow significantly reduced soil erosion and water loss, grass stripe and contour ditch had recorded reduction in water and soil losses although to a much less extent than above 3 farming systems. most of sediment was bed load in all the systems except in contour dams and contour fanning
研究的主要結論如下： 1 、運用坡面徑流小區法系統地研究了當地農業生產活動中不同農作措施下紅壤坡耕地水土流失特徵、土壤養分流失規律及形態特徵，結果表明： （ 1 ）同順坡農作措施相比：其它農作措施均具有明顯減輕水土流失的作用，等高土埂，等高農作、休閑處理控制水土流失的效果優於水平草帶和水平溝處理。 -
This kind of instability bulk movement is induced by wave cyclic loading, as a result the slope of bottom bed decrease, water depth increase, and instability bulk movement has the character of subregion, regularity and head erosion, thus it will influence evolvement of region of interest landform, and change flow field and bottom stratum condition continually, so will lead to dynamic influence on structure foundation soil
這種不穩定塊體運動由波浪循環荷載誘發，其結果使底床整體坡度減緩，水深加大，而且不穩定的塊體運動具有小區域、多發性和溯源侵蝕的特點，將繼續影響著海域以後的水深地形的發展演化，並不斷改變著該區的流場與底床地層條件，對構築物地基土的穩定性產生著動態的影響。 -
( 3 ) the farming systems which had a less degree of soil erosion and sedimentation, organic carbon was lost mainly through runoff but in farming systems in which soil erosion was serious such as in grass stripe, contour ditch, traditional farming system, the loss was through bed load. nitrogen loss through runoff was 81. 9 % - 93. 4 % of the total. this loss through runoff comprised 78 % - 87. 6 % dissolved nhvn and no " 3 - n although the former was slightly higher than latter as it made up 55. 14 % of the lost nitrogen
（ 3 ）侵蝕程度較輕，泥沙流失量較小，特別是推移質流失量較小的農作措施處理的徑流小區，如休閑處理、等高土埂和等高處理的小區中有機碳流失以徑流流失為主，相反，如水平草帶處理、水平溝處理和順坡農作處理的徑流小區中，有機碳流浙江大學博土學位論文失以推移質流失為主。
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