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3D numerical simulation of seagrass movement under waves and currents with GPUSPH

International Journal of Sediment Research 2021年第6期36卷 711-722页

作者： anne-eléonore paquier Thibault Oudart Caroline Le Bouteiller Samuel Meulé Philippe Larroudé Robert A.Dalrymple BRGM Immeuble Agostini Aix-Marseille University CNRS IRD INRA Grenoble INP (Institute of Engineering) Univerity Grenoble Alpes University Grenoble Alpes Department of Civil Engineering Johns Hopkins University

The current study tries a new approach to simulating interactions between waves and seagrass through Smoothed Particle Hydrodynamics(SPH). In this model, the plants are defined as a solid that respects Hooke’s law, and are assumed to have direct interaction with the fluid. Given the characteristics of the SPH method, especially in terms of computational time, the dimensions of the simulations were *** first goal of the current study was to optimize the approach to avoid reaching certain limits such as the rupture of the simulated plant. Plant movements under waves and/or currents have been studied by several authors in various in-situ, physical, and numerical experiments concerning various vegetation species, thus proving that plant movements can be successfully reproduced by SPH 2D/3D. Manning’s roughness coefficient, n, was calculated to confirm that the results were in accordance with what had been measured in flume studies. Even though there is still room for improvement, it is shown that this method can be used to estimate Manning’s coefficient for coastal vegetation(seagrass and saltmarsh vegetation) and to greatly improve the modeling and forecasting of coastal erosion and storm surge risks by including the effects of vegetation in integrated models.

关键词： Numerical seagrass movement GPUSPH Fluid structure interaction Waves Current

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An optimized use of limited ground based topographic data for river applications

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International Journal of Sediment Research 2019年第3期34卷 216-225页

作者： Mohamed Jaballah Benoit Camenen ANDré paquier Magali Jodeau Irstea UR River Ly centre de Lyon-Villeurbanne EDF R&D

A prime requirement for hydrological applications, such as sediment budgeting or numerical modelling,is that produced Digital Terrain Models(DTMs) accurately represent the shape of landforms, especially for river reaches where data are not homogeneous. DTM error is a function of data point measurement accuracy and density and also of the field survey strategy when limited amounts of data will be *** paper aims to advance the importance of the field survey strategy for the specific, but common cases, where only limited topographic data will be available. This methodology is based on the idea that any feature can be properly described by a set of cross sections and breaklines describing both main and secondary directions of the flow. Then, a longitudinal linear interpolation can be applied to the defined homogeneous zones. This morphologically oriented(MO) method that includes data acquisition strategy and interpolation, was validated using a reference DTM derived from Li DAR measurements. An estimation of the uncertainties also is suggested based on the distance of the nearest point and the local slope using a geographically weighted regression. The proposed MO method is typically applicable to Alpine river reaches characterized by multiple channels that may always be underwater and not navigable such as an alternate bar system with secondary and transverse channels.

关键词： Digital Terrain Model Survey strategy Interpolation DTM error Gravel bar

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A CONTRIBUTION TO THE NUMERICAL MODelLING OF DAM RESERVOIRS SILTATION CYCLES

A CONTRIBUTION TO THE NUMERICAL MODELLING OF DAM RESERVOIRS ...

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Sixteenth International Water Technology Conference

作者： BESSENASSE M.-paquier A.-MOULLA Saad Dahlab University Blida – Algeria CEMAGREF Hydrology & Hydraulics Research UnitLyon – France Dating & Isotope Tracing Dept.

Sediment transport by water is undoubtedly one of the disciplines of hydraulic science that remained the most unknown. If Saint-Venant could establish a century ago his famous equations that still prevails in Hydraulic modelling nothing comparable exists regarding solid transport. In Algeria, catchment erosion and siltation rates are high enough to significantly reduce the useful volumes of dams. The water mobilisation potential represented by dams decreases by 40 Mm3 yearly which is considerable. The total capacity of the dams managed by the National Agency for Dams and Water Transfers is estimated to be 6.2 Bm3 while the silted volume is estimated at 700 Mm3, which is about 12%. Therefore, the survey of this phenomenon is so crucial for assessing its intensity, and later on to define the right actions that are to be implemented in order to minimize the siltation risk, particularly when it comes to the choice of the most appropriate sites for new reservoirs. The development of mathematical models that are capable of simulating the deposition in a reservoir as a function of the hydrologic regime is required as a complementary tool to the overall analysis of the other watershed inputs. Once proven efficient, these models will become useful in the establishment of well adapted catchment management programmes. The development of a numerical model for predicting sediment deposition upstream of a dam requires, first, a critical analysis of the available data and their reliability with respect to the accuracy of the expected results and secondly, the choice of a calculation method suitable for that data, for the dominant processes and for the objectives of the study. This paper discusses the general methodology that was adopted for conceiving such a sediment transport numerical model.

关键词： Reservoir siltation Numerical model dam preservation Algeria

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Landau-kleffner综合征或伴有抽搐的获得性失语

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国外医学（神经病学．神经外科学分册） 1992年第6期19卷 313-315页

作者： paquier PF 吕冰清

Landau-Kleffner综合征(LKS)或伴有抽搐的获得性失语(acquired aphasia with convulsive disorder)是一种罕见的语言障碍,多数伴有不同形式的癫痫发作和普遍双侧同步的棘慢活动(SW)脑电图异常,也可见于无任何临床抽搐的患儿.1957年由Lan... 详细信息

Landau-Kleffner综合征(LKS)或伴有抽搐的获得性失语(acquired aphasia with convulsive disorder)是一种罕见的语言障碍,多数伴有不同形式的癫痫发作和普遍双侧同步的棘慢活动(SW)脑电图异常,也可见于无任何临床抽搐的患儿.1957年由Landau和Kleffner最先报告,并认为其临床表现甚为重要.尽管推测LKS十分少见,但自1957年至1990年间已有160例以上的病例报告。

关键词： LKS 抽搐失语获得性癫痫

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