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| 1 | 混凝土面板砂砾石坝漫顶溃坝模型研究显示文摘基于沟后面板砂砾石坝溃坝案例调研资料及溃坝离心模型试验的反馈分析,提出了一个可描述混凝土面板砂砾石坝漫顶溃决过程的数学模型。该模型的特点是选择可反映高速水流作用下推移质与悬移质运动的坝料输移公式描述宽级配砂砾料的运动特征,以及建立可模拟面板坝每块钢筋混凝土面板在各种变化荷载作用下破坏过程的表达式。选择沟后面板砂砾石坝溃坝案例对建立的模型进行验证,计算结果与实测结果的对比表明:溃口峰值流量、堆石体溃口的顶宽与底宽、折断的面板的数量和各面板的破坏长度、溃坝历时等输出参数的相对误差均控制在±15%以内;由于溃坝过程中面板不断折断,溃口流量过程呈锯齿状抬升。另外,参数敏感性分析的结果表明坝料的冲蚀率和级配特征对溃坝流量过程具有重要的影响。 | 钟启明 沈光泽 | 2019 | 岩土工程学报2019，41，9： | 3 |
| 2 | 泥沙输移问题研究进展与展望显示文摘泥沙输移问题一直是国内外泥沙学者研究的热点问题。通过回顾推移质泥沙起动输移特性、悬移质运动规律,分析阐述了泥沙输移领域的一些主流研究成果、存在的不足及今后研究的热点及难点。认为近底瞬时作用流速、床面泥沙非均匀性及床面泥沙随机分布规律仍将是当前及今后研究的热点和方向;群体泥沙颗粒间的相互作用是揭示推移质群体运动机理的重要基础及前提;悬移质泥沙输移理论尚不成熟的主要原因,仍然是对泥沙颗粒悬浮、扩散与交换机理认识不清。 | 张根广 周双 王愉乐 刘余 | 2019 | 水利与建筑工程学报2019，17，4： | 2 |
| 3 | 汾河二坝—义棠段液压坝群对河道冲淤变化影响的数值研究显示文摘在中小河流中连续修建多座液压坝,会对河道水动力及泥沙冲淤过程产生较大影响,液压坝群不同的运行方案导致河道冲淤变化特性也有所不同。针对此问题,基于Delft3D FM软件,选取了4场典型洪水过程,对汾河二坝—义棠段进行二维水沙数值模拟,在设定的4种液压坝群运行方案下,研究了液压坝群对河道冲淤变化特性的影响,为液压坝群在汾河中游的调度提供参考。研究结果表明:对于4场洪水情况下方案1—方案4,在模拟时段末,14#坝的坝前水深分别约为0.5~1.4、1.3~2.8、0.6~1.8、0.5~1.6 m,坝后局部流速最大分别约为1.5~2.5、2.0~6.0、2.0~3.0、2.0~2.5 m/s;从河道冲淤变化统计来看,泥沙冲淤范围分别约为-0.5~1.4、-0.3~1.9、-0.5~1.6、-0.5~1.5 m;河道泥沙淤积总量变化范围分别约为(4.9~242.3)万、(5.3~323.5)万、(5.0~252.5)万、(4.95~245.1)万m^(3)。所得结论如下:液压坝全部运行时对水动力场和床面高程变化影响最大;4场洪水情况下,液压坝全部运行时泥沙淤积量约为无坝运行时的1.08~1.36倍。 | 张小雅 任春平 杨帆 | 2023 | 长江科学院院报2023，40，8： | 1 |
| 4 | A quasi single-phase model for debris flows and its comparison with a two-phase model显示文摘A depth-averaged quasi single-phase mixture model is proposed for debris flows over inclined bed slopes based on the shallow water hydrosediment-morphodynamic theory with multi grain sizes. The stresses due to fluctuations are incorporated based on analogy to turbulent flows, as estimated using the depth-averaged k-? turbulence model and a modification component. A fully conservative numerical algorithm, using wellbalanced slope limited centred scheme, is deployed to solve the governing equations. The present quasi single-phase model using four closure relationships for the bed shear stresses is evaluated against USGS experimental debris flow and compared with traditional quasi single-phase models and a recent physically enhanced two-phase model. It is found that the present quasi single-phase model performs much better than the traditional models, and is attractive in terms of computational cost while the two-phase model performs even better appreciably. | XIA Chun-chen LI Ji CAO Zhi-xian LIU Qing-quan HU Kai-heng | 2018 | Journal of Mountain Science2018，15，5： | 0 |
| 5 | 钱塘江河口盐官段主汛期前含沙量特性研究显示文摘钱塘江河口水沙运动极其复杂,特别是泥沙输移问题历来备受关注。然而河口涌潮河段的含沙量观测非常困难,目前对含沙量精细化的系统实测分析及其规律研究仍相对缺乏。以钱塘江北岸海宁段在主汛期前需修建的围堰工程及其泥沙冲淤问题为背景,采用2022年4—6月钱塘江盐官段北岸盐官潮位站连续多日实测含沙量展开分析研究。根据潮差级别(大潮、中潮、小潮)和潮时(涨潮前、涨潮期、平潮期、退潮期)对含沙量数据进行划分和分析。利用从盐官潮位站获取的同时期浊度与实测含沙量进行数据拟合,分别按潮差级别和浊度区间划分得到两组拟合曲线,相关度约为0.9。拟合曲线经验证后运用于7月潮位与拟合含沙量的分析对比。结果表明:大潮时含沙量离散程度最大,中潮次之,小潮最小;小潮的4个潮时含沙量变化不大,中潮和大潮涨潮期的含沙量均有明显上升,高平潮期含沙量有所下降,经退潮期回归至涨潮前水平。总体而言,含沙量曲线与潮位曲线存在相似的周期性关系,但在退潮期,含沙量会再次出现先升后降的过程,这可能是由于退潮阶段落急时流速增加,部分床面泥沙再次随水流运动,但随着落急到落憩的转变,退潮变缓,含沙量再次下降。本研究进一步加深了对河口含沙量演变规律的认识,可为河口工程的泥沙研究提供借鉴。 | 胡智超 朱沈鸣 李建雄 许嘉豪 王绍斌 夏春晨 | 2023 | 水利水运工程学报2023，，6： | 0 |
| 6 | Coupled and splitting bedload sediment transport models based on a modified flux-wave approach显示文摘Numerical modeling of free-surface flow over a mobile bed with predominantly bedload sediment transport can be done by solving the shallow water and Exner equations using coupled and splitting approaches.The coupled method uses a coupling of the governing equations at the same time step leading to a non-conservative solution.The splitting method solves the Exner and the shallow water equations in a separate manner,and is only capable of modeling weak free-surface and bedload interactions.In the current study,an extended version of a Godunov-type wave propagation algorithm is presented for modeling of morphodynamic systems using both coupled and splitting approaches.In the introduced coupled method the entire morphodynamic system is solved in the form of a conservation law.For the splitting technique,a new wave Riemann decomposition is defined which enables the scheme to be utilized for mild and strong interactions.To consider the bedload sediment discharge within the Exner equation,the Smart and Meyer-Peter&Müller formulae are used.It was found that the coupled solution gives accurate predictions for all investigated flow regimes including propagation over a dry-state using a Courant-Friedrichs-Lewy(CFL)number equal to 0.6.Furthermore,the splitting method was able to model all flow regimes with a lower CFL number of 0.3. | Hossein Mahdizadeh Soroosh Sharifi | 2021 | International Journal of Sediment Research2021，36，1： | 0 |
| 7 | Numerical simulation of sedimentation process in reservoirs and development of a non-coupled algorithm to improve long-term modeling显示文摘This paper investigates the validity of a quasi-steady approximation for sediment transport and presents a new algorithm based on this concept.The developed non-coupled algorithm interacts among hydrodynamic,sediment,and morphology modules which are based on depth-averaged Navier-Stokes equations for the flow,the three-dimensional equation of conservation of sediment,and the mass balance between the bed and sediment(Exner equation)to simulate the reservoir sedimentation process.The non-coupled algorithm solves both the short-term scale and the relatively long-term scale problems of reservoir sedimentation.The proposed algorithm is verified using field data and by comparison with other accurate algorithms.Based upon the results of this investigation,the developed algorithm can be used to simulate long-term reservoir sedimentation while considerably decreasing the computational costs and preserving computational accuracy.The computational cost of the noncoupled algorithm is about 97% less than the conventional semi-coupled approach whereas the errors(Root Mean Square Error,Average Relative Error,and Maximum Relative Error of bed level)of the developed algorithm are approximately 15% greater than those for the semi-coupled algorithm for the average value. | Zeinab Khorrami Mohammad Ali Banihashemin | 2019 | International Journal of Sediment Research2019，34，3： | 0 |
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