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HYBRID FINITE ANALYTIC SOLUTIONS OF SHALLOW WATER CIRCULATION

Applied Mathematics and Mechanics(English Edition) 2003年第9期24卷 1081-1088页

作者：槐文信沈毅一小松利光 State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Civil and Coastal Engineering Department University of FloridaGainesville Department of Civil Engineering Kyushu University

The hybrid finite analytic(HFA) method is a kind of numerical scheme in rectangular element. In order to simulate the shallow circulation in irregular bathymetry by HFA scheme, the model in sigma coordinate system was obtained. The model has been tested against three cases: 1) Wind induced circulation; 2) Density driven circulation and 3) seiche oscillation. The results obtained in the present study compare well with those obtained from the corresponding analytical solutions under idealized for the above three cases. The hybrid finite analytic method and the circulation model in sigma coordinate system can be used calculate the flow and water quality in estuaries and coastal waters.

关键词： tidal flow wind stress circulation shallow water seiche hybrid finite analytic method density gradient

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Potential Hazards of Eruptions around the Tianchi Caldera Lake, China

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Acta Geologica Sinica(English Edition) 2004年第3期78卷 790-794页

作者： WEIHaiquan HONGHanjing R.S.J.SPARKS J.S.WALDER HANBin InstituteofGeology ChinaSeismologicalBureauBeijing100029 DepartmentofEarthSciences BristolUniversityUK CascadesVolcanoObservatory USGeologicalSurveyUSA

Since the eruption of the Tianchi volcano about 1000 years ago, there have been at least 3 to 5 eruptions of small to moderate size. In addition, hazardous avalanches, rock falls and debris flows have occurred during periods between eruptions. A future eruption of the Tianchi volcano is likely to involve explosive interaction between magma and the caldera lake. The volume of erupted magma is almost in a range of 0.1-0.5 km3. Tephra fallout may damage agriculture in a large area near the volcano. If only 1% of the lake water were ejected during an eruption and then precipitated over an area of 200 km2, the average rainfall would be 100 mm. Moreover, lahars are likely to occur as both tephra and water ejected from the caldera lake fall onto flanks of the volcano. Rocks avalanching into the caldera lake also would bring about grave hazards because seiches would be triggered and lake water with the volume equal to that of the landslide would spill out of the existing breach in the caldera and cause flooding downstream.

关键词： Tianchi volcano eruption of small to moderate size seiche harzerd NE China

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Simulating Long Waves in a Coifs Harbour 3D Physical Model Using Short Wave Spectra

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Journal of Shipping and Ocean Engineering 2016年第1期6卷 15-21页

作者： Indra FW Jayewardene, Ed Couriel Oliver Light Mark Kulmar Malcolm Robertson Manly Hydraulics Laboratory (MHL) NSW Public Works Sydney AUSTRALIA Formerly MHL now AECOM Sydney AUSTRALIA Coifs Harbour City Council Coffs Harbour AUSTRALIA

This paper presents examples of field data of extreme seiche waves measured at Coffs Harbour by MHL and describes the generation and measuring methodology to detect and reduce seiche agitation in the Coifs Harbour boat ramp using a 3D physical model. The paper also discusses the techniques in investigating a short wave problem of stability in the same model where a long wave is simulated. Waves offshore of Coffs Harbour at 80 m depth have been recorded by MHL for a period of over 30 years. Long waves have been simultaneously measured in the harbour over a period of a decade. These data enabled the model to be verified on two dates （4/6/12, 5/9/14） when high long waves were recorded at the boat ramp harbour under storm and non-storm conditions. Long waves are generated in harbours due to group bounded long wave and surf beat or edge waves. The paper presents methodologies of generating long waves both numerically and by using physical models, and discusses the advantages and disadvantages of these generation techniques. Numerical modelling carried out using long period regular waves in a previous investigation predicted reductions up to 50% due to change of planform of the boat ramp harbour where an area next to the boat ramp was excavated and roughness elements introduced to dampen long periods. The 3D physical model simulated a 25% decrease in the long wave energy in the boat ramp when a suitable change in the planform was made. A 3D undistorted model of scale 1：58 was used in the investigation.

关键词： seiche group bounded long waves surf beat planform.

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Four Algorithms for Boundary Control with Breaking in Space and Time

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Journal of Applied Mathematics and Physics 2019年第11期7卷 2891-2901页

作者： Vladimir Arabadzhi Division of Geophysical Research Institute of Applied Physics Nizhny Novgorod Russian

Typically, active control systems either have a priori complete information about the boundary-value problem and damped waves before switching on, or get it during the measurement process or accumulate and update information online (identification process in adaptive systems). In this case, the boundary problem is completely imprinted in the information arrays of the control system. However, very often complete information about a boundary-value problem is not available in principle or this info is changing in time faster than the process of its accumulation. The article considers examples of boundary control algorithms based almost without any information. The algorithms presented in the article cannot be obtained within the framework of the harmonic representation of the problem by complex amplitudes. And these algorithms carry out fast control in microstructured boundary problems. It is shown that in some cases it is possible to find simple solutions if we remove restrictions: 1) on the spatio-temporal resolution of controlling elements of a boundary-value problem;2) on the high-frequency radiation of the controlled boundary.

关键词： Incident Low Frequency Wave High Frequency Technological Radiation Fast Control in Microstructured Boundary Problems Binary Breaker Breaker-Inverter Length of Damping Spinning Acoustic Blades Gas Stream seiche Waves

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