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In this model, the probability constituent plays an important role for different types of sediment movement within the range of velocities close to critical values.
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The doctoral research of Albert Frank Shields on sediment movement conducted in Technischen Hochshcule Berlin becomes a legend that is most often referred by many authors and has initiated a sizable number of researches over last seven decades.
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Despite the nature of sediment movement in a high-energy environment, haustoriid drift may have an active as well as passive component.
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Preliminary results suggest that in undisturbed sites little sediment movement has occurred over the time scale of cesium-137 (the last 35 years) but that the landscape has been well sorted over a much longer time scale.
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There is some sediment movement in both onshore and offshore directions although offshore transport appears minor.
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Effects of forest vegetation on runoff and sediment transport of watershed in Loess area, west China
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Forest watersheds and farmland watersheds with similar terrain features were selected through cluster analysis to study their runoff and sediment transport characteristics.
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Today, these valleys serve as routes of sediment transport to slope bases and central parts of basins.
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Analysis of Flow and Sediment Transport Characteristics in Sand Beds
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Calculating Sediment Transport in the Coastal Zone of the Sea
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The results of experiments with coarse sand were used to derive, for the first time, a formula for the estimation of the score depth, including two similarity criteria-the sediment motion factor (SM-factor), and Keulegan-Carpenter number.
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In the diffusion approximation, the vertical distribution of the concentration of wave-suspended sediments is obtained for the case when the tangential bottom stress exceeds the critical values corresponding to the start of sediment motion.
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The Shields diagram is famous due to its application in ascertaining the threshold of sediment motion that is an essential prerequisite for the estimation of sediment transport in an alluvial stream.
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Considering surface wave activity to be a random process reduces sediment motion to a random walk which is governed by a diffusion equation.
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The technique proposed also enables measurement of the time variation of the quantities and the two dimensional direction of sediment motion, for a complete characterization of grain kinematics in solid transport processes.
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The locations of bedform fields were noted, fluorescent sand was used to follow the sand movement and, at the end of the experiment, lacquer peels were taken of the top 0.2m of a vertical section through the ridge- and- runnel.
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The effects of sand movement on intertidal seaweeds and selected invertebrates at Bound Rock, New Hampshire, USA
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A seasonal study of sand movement and the benthic intertidal organisms at Bound Rock, New Hampshire, USA was conducted between November, 1973 and February, 1975.
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Sand movement was highly unpredictable both spatially and temporally on a local scale.
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Wind action and sand movement near Holkham Bay, North Norfolk Coast, England
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| | In thie paper field measurements and laboratory Experiments are cited to illustrate the differences between the bed-material load and the wash-load.Such differences can be summarized in the following table: | | 本文根据河流实测资料及水槽试验结果,指出河流中粗细不同的泥沙的运动尽管受制于同一规律,可是粗细不同的泥沙在外表的表现上,以及对实际工程问题所起的作用上,却有极大的不同,因此有分别定名的必要。 | | 文摘来源 | | It is pointed out in this article, as river processes are tightly related with structures of circulating flow, closed or spiral, comprehension on the former, either quantitative or qualitative, can never be well accomplished if only longitudinal flow along the river axis is considered, as done in now a days. The elassification and general features of circulating flows are explained. General processes of different modes of river stretch as well as stability of rivers in alluvial plains are described; and the... | | 本文在指出現阶段中、只是凭藉縱向水流的分析、研究河道演变问题、所存在的局限性以后,說明了环流的涵义、分类和共同性質;通过各种类型河段的演变特征闡述了环流結构与河道演变的关系;探討了环流結构与冲积平原河流的稳定性的关系。最后指出,在重視水流紊动結构的观测試驗研究工作的同时,应該强調环流結构及其与泥沙运动的关系的观測試驗研究工作。这种系統而深入的观測試驗研究工作,有可能把河流动力学从現有水平推向更高阶段。 | | 文摘来源 | | The settling velocity of sedimentary particles in still water is an important index in the study of the mechanics of sediment motion. The definition of the so-called"fine particles" is first given by analysing the laws of settling in still water and of initial movement of sediment. The standard for calculating the settling velocity of fine particles is discussed in both the"dispersed system" and the"flocculated system". The general law of the settling movement of fine particles is analysed with the consider... | | 在靜水中的泥沙沉速,是研究泥沙运动規律时的一个重要指标.本文首先从泥沙的靜水沉降和水流中起动的一般規律出发,給出了細顆粒泥沙界說的分析过程和結論,并討論了在分散体系和集成体系中有关細顆粒泥沙組靜水沉速的計量标准.其次从絮擬作用对于細顆粒泥沙靜水沉降的影响出发,分析并解释了細顆粒泥沙在靜水中沉降的一般性規律.最后給出了在各种情况下計算細顆粒泥沙靜水沉速的建議公式. | | 文摘来源 | | | | << 更多相关文摘 |
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泥沙运动
sediment movement
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