1) sediment motions
泥沙活动
2) sediment incipience
泥沙起动
1.
Homogenous turbulence structure near the wall and sediment incipience;
各向同性均匀湍流近壁结构及泥沙起动
2.
Assuming that the instantaneous bed shear stress is the hydrodynamic mechanism of sediment incipience and transportation,the numerical model of the local scour under the complex flows around the structures is presented.
以床面瞬时剪应力作为泥沙起动及输运的水动力机制,建立了结构物周围复杂流场下床面局部冲刷的数学模型。
3.
As one of the most basic problems in the sediment transport theory, the mechanism of the sediment incipience is also needed to be understood for the study of local scouring process.
泥沙起动是泥沙运动理论中最基本的问题之一,也是研究泥沙输运及局部冲刷时必需解决的问题。
3) sediment transport
泥沙运动
1.
Study on the sediment transport direction on the beach of Taozi Bay,Yantai;
烟台套子湾海滩泥沙运动方向研究
2.
On the effective shear stress of sediment transport;
确定泥沙运动有效切应力方法的探讨
3.
The authors analyze the surface sediment diameter characteristics in the east of Haikou Bay using EOF method,and draw some conclusion on the sediment sources and main hydrodynamics factors which control the sediment transport in the east of Haikou Bay.
作者对海口湾东部表层沉积物的粒径用EOF方法进行了分析 ,得出了海口湾东部浅滩区的泥沙来源与控制泥沙运动的主要动力因素 ,为对海口湾东部浅滩区的科学整治提供了依据。
4) sediment movement
泥沙运动
1.
And it is found that the sediment movement is consistent with the action of waves.
发现大风天气海底泥沙对波浪作用反应灵敏,悬沙和底沙分布规律与波浪作用吻合,为波浪作用下海底泥沙运动的理论研究以及海区工程开发提供了科学依据。
2.
The total flow differential model of sediment density current is used to simulate the sediment movement in the reservoir at dam.
运用异重流总流微分模型预测水库坝址泥沙运动过程,在满足防洪安全的前提下,结合水库入库洪水过程,进行旨在水库排沙比最大的水沙联合调度研究,最后给出实例。
3.
The remote sensing image analysis of the sea area where Binzhou Port is located has revealed the characteristics of sediment distribution in the sea area and the pattern of sediment movement under different conditions.
从泥沙运动的角度而言,受已建导堤影响,落潮水流和风吹流、波生流等叠加可能形成较复杂的向外水流和环流,携带泥沙向外输运,使高含沙水体运动更远的距离,一般情况下可达-6 m等深线以远。
5) sediment incipient motion
泥沙起动
1.
Experimental study on the sediment incipient motion in circulating flow;
回流泥沙起动规律的试验研究
2.
Because the resistance in sediment incipient motion is the sand-grain resistance,it is proposed that computation of the sand-grain resistance is based on resistance of sediment incipient motion.
利用泥沙起动的Shields曲线与明渠阻力特性之间的相似性,结合实测泥沙起动资料给出了沙粒阻力的计算公式。
3.
The motion characteristics of the sand group are researched from the perspective of theory and the dynamic condition for sediment incipient motion is obtained by determining the critical Shearing Stress, which can get rid of the influence of experiential factors and the research of sediment will radically start strict theoretical exploration.
根据波浪作用下的推移质群体泥沙运动方程可以看出推移质运动具有明显的非线性特性,对非线性动力学特性进行分析得到了考虑离散力时泥沙起动的希尔兹(Shields)曲线及一般形式的推移质输沙公式。
6) sediment motion
泥沙运动
1.
Analysis of near-bed sediment motion;
床面附近泥沙运动的分析
2.
Sediment problems in the environment, and enviromental problems caused by sediment motion are discussed in this paper.
从两个方面,即水环境中的泥沙问题和泥沙运动引起的环境问题出发,说明了环境中泥沙问题的普遍性,指出了结合泥沙运动研究环境问题和结合环境科学研究泥沙问题的重要性和必要性,并将这方面的工作概括为“环境泥沙学”。
3.
were separately applied in analyzing and investigating the sediment motion lawin the hydraulic fill area at the estuary of Zhuhai River and the influence on the channel.
本文分别采用了现场水文测验、抛泥追测实验以及中子活化示踪等多种测试手段,对珠江口伶仃洋挖泥水抛区的泥沙运动规律及其对航道的影响进行了分析研究。
补充资料:坝区泥沙淤积
坝区泥沙淤积
sedimentation in dam area
boqLJ rl}sho ytljl坝区泥沙淤积(Sedimentation in dam area)河流上筑坝塑水后,由于塑水区内水深加大,流速降低,泥沙沿程淤积,并向坝前推进,造成坝前泥沙的淤积。坝区泥沙淤积产生的问题主要有:①在船闸引航道中及其口门附近产生淤积,使航深不足或水流不顺而有碍通航。②电站进水口前的泥沙堆积使过机水流中的含沙量增大,泥沙变粗,造成过水建筑物或水轮机过流部件的严重磨损。③坝前泥沙淤积有可能影响问门启闭,堵塞泄水孔,影响大坝安全。 以通航为主的枢纽和以发电为主的枢纽对坝区水流条件的要求不同,防治坝区泥沙淤积的措施也不一样。 (1)以通航为主的枢纽。宜将船闸布置在靠近稳定深乱线一侧,要避开弯道的凸岸和回流、缓流区。这些地区都是泥沙集中淤积处,且淤积后又难于冲走。结合各个工程的实际情况,可设置某些导流排沙工程,如修建引航导墙以破除回流减少淤积;设置底部高程较低的冲沙闸,以定期冲刷上游及下游引航道淤沙。 (2)以发电为主的枢纽。高水头水电站的防沙措施主要是设置高程较低的排沙孔。排沙孔布置在机组进水口的下面,防沙效果最好,但结构复杂,施工及管理都不便。一般把排沙孔设在进水口的侧下方,其位置以使进水口处在冲刷漏斗的影响范围之内为原则。低水头枢纽的防沙措施,主要是进行合理的平面布置。如利用弯道环流特性,正面取水,侧面排沙,同时设置导沙坎,常能取得较好的防沙效果。在中小型水库中,也可采取清浑水分治的办法,即在童水区上游修建排浑渠(或排浑洞),当汛期洪水人库时,可将浑水通过排浑渠(洞)直接排往坝下游,减少主库淤积,缓解坝区泥沙问题。
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参考词条