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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 | |
The performance of the model is evaluated by comparing the predicted and observed concentrations in the water and sediment of the Liao River.
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Experiments that involved the addition of 14CH4 to water and sediment samples showed that a considerable part of methane is oxidized in the upper horizons of bottom sediments and in the water column.
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Increased water and sediment pollution by industrial and sewage discharge were found to most significantly affect the abundance of larvae, food composition, and the availability of substrata suitable for larva to settle.
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Assessment of Water and Sediment Quality in Fresh Water Bodies Based on Characteristics of Benthic Communities
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The influence of the huge river water and sediment runoff and tides on the hydrological and morphological processes in the Yangtze River mouth is shown.
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Analysis of Flow and Sediment Transport Characteristics in Sand Beds
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Hydrologic and hydraulic characteristics of the Yellow River and impact of flow and sediment diversion
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The evaluation coefficients for simulated flow and sediment, and observed flow and sediment were all above 0.7, which shows that SWAT model could be a useful tool for water resources and soil conservation planning in the Huanghe River basin.
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Variation in flow and sediment of Dasha River and influence of human activities on it in southwest region of Anhui province
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Based on the observational records from the Dasha River, the authors analyze the character of the variation in flow and sediment in different flood and dry seasons from 1970 to 2000.
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The Mn/Fe ratio is maximal in samples taken from the lateral sectors of nodule at the water-sediment interface.
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Strong water-sediment interaction due to shallow water depth in the Changjiang Estuary leads to remarkable concentration peaks of dissolved REE in the location where the salinity varies from 1 to 8 mg/g.
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The surface sediment will exert great effects on the nutrient exchange between water-sediment interface via adsorption and release of nutrient.
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A wave flume experiment was conducted to study nutrient fluxes at water-sediment interface of Meiliang Bay under different hydrodynamic conditions.
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Seasonal variations of adsorption/desorption equilibrium concentrations of P at water-sediment interface in different trophic st
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A review is presented of numerous experimental data that exhibit anomalies in sound transmission through the water-sand interface of the sea bottom at overcritical angles of incidence.
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The temporal evolution of a water-sand interface driven by gravity is experimentally investigated.
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| | Modelling techniques, including the similarity criteria, distortion limita-tions, selection of model sediment materials for the yellow River movable-bed models are briefly discussed in this paper.Yellow River is characterized in its broad and narrow cross sestion , fine bed material composition and drastic change of river bed. These characteristics should be taken into consideration in selecting the distortion ratio and in the establishment of the similaity criteria when a movable-bed model is designed.Acco... | | 本文介绍了黄河动床模型试验的基本方法,包括相似条件、变率的选择、模型沙的选配、以及模型加糙方法等。本文认为黄河河床宽浅、泥沙细、河床冲淤变幅大,进行黄河动床模型试验,应该根据黄河的水沙特点及边界条件和试验任务来选择相似准则和模型变率。根据我们的经验,黄河动床模型的变率与水平比尺和垂直比尺之间的关系为,底沙运动相似条件为悬沙运动相似条件为,悬沙比尺与底沙比尺之间的关系为。黄河动床模型的水深不大,形成沙浪后,在主槽内,不必加糙仍有可能满足阻力相似条件,其办法是按照公式(24)选择模型沙及模型比降。按照上述方法,进行了几个模型试验,均取得了河床冲淤、水位变化过程与原型基本相似的验证试验成果。 | | 文摘来源 | | In this paper two problems are discussed. Firstly, a fixed river model of goosehead pattern braided channel is made to observe the flow structure and sediment transportation in an island head. The results of model testing indicate that the saddle back of the thalweg profile of sesondary branching is an important factor to control the flow and sediment, that the flow is branched from channel bed to water surface along the down stream direction gradually, and that there is a single direct circulating flow in ... | | 本文首先根据概化的分汉河道模型(八卦洲汉道)实测资料,对汉道首部水流运动特性作了试验研究,着重强调了支汉倒坎的存在对水流结构所起的作用,并指出汊道分流是自河底开始沿流程向水面逐渐完成的。同时获得该汉道存在单向环流的试验成果。其次,根据水流分汊导致环流存在的特点,引用弯道环流横向输沙概念,进而从环流角度分析汉道的泥沙横向输移,并提出了泥沙横向转移的两种运动形式:“主汉转移”、“支汉转移”。最后,根据汉首河床特征与水、沙特征,建立了综合考虑纵向、横向输沙的分沙模式,并给出了主汉分沙比计算公式(12)、(14),经过验证,比较符合实际。 | | 文摘来源 | | Based on the solution of differential equations, this paper provides a formula to calculate the effectiveness of the reservoir headward erosion by lowering the water level behind the dam in any rate. Two control ways of scouring operation are chiefly analysed. The first one is to lower the water level at uniform rate. Analysis shows that the faster the lowering rate, the greater the sediment dischage by scouring would be. Thus, the storage capacity of a reservoir can be restored in a .short time by lowering... | | 本文在求解溯源冲刷偏微分方程的基础上,给出了进库水沙以及坝前水位等均随时间变化的条件下,溯源冲刷输沙率、冲刷量以及冲刷河槽纵剖面变化过程的计算公式。公式中的无尺度自变量,即所谓无尺度冲刷时间T,是水库长度,淤积物抗冲性,冲刷流量以及冲刷时间等因素的无尺度组合体,因而可以比较清晰地从理论上说明以上各种因素对冲刷效果的影响。 鉴于坝前水位下降的幅度与快慢,对冲刷效果起到主导作用,也是人工控制冲刷发展的可行途径,本文重点讨论了不同的坝前水位下降方式对冲刷强度(净冲刷输沙率)以及总冲刷量的影响。以最快的速度降低水位可获得最大的冲刷效果,但对于要限制冲刷强度的水库,安全运转可能因此受到破坏。本文提出的“等强度”控制方式(B方式),可使溯源冲刷被控制在安全限度内而又最大限度地减少冲刷水耗。 | | 文摘来源 | | | | << 更多相关文摘 |
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水沙
water and sediment
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