In recent years, studies show that coal formed during marine transigression process is also important in coal accumulation basin. Still, the characteristics of coal formation is more clearly demonstrated by the coal f...In recent years, studies show that coal formed during marine transigression process is also important in coal accumulation basin. Still, the characteristics of coal formation is more clearly demonstrated by the coal formation in TST in the sequence stratigraphic framework. Based on the study of the characteristics of coal formation in epicontinental coal accumulation basin, the viewpoint that coal was formed under marine transgression was put forward by the authors and the mechenism thereof was also analyized. Marine transgression resulted in the forming of swamp and then the peat swamp. And the transgression later on put the peat formed in advance in deep water environment to form coal in the end. The important stratigraphic horrizons, such as coal seams, marine facies layers, formed with marine transgression are of the property of isochronism.展开更多
During the last two decades research on the Devonian period was part of some successful IGCP projects, such as IGCP 216 """"""""Global biological events in Earth history"&q...During the last two decades research on the Devonian period was part of some successful IGCP projects, such as IGCP 216 """"""""Global biological events in Earth history"""""""" (led by O.H. Walliser), IGCP 335 """"""""Biotic recoveries from mass extinctions"""""""" (led by D.H.Erwin and E.G. Kauffman), and IGCP 421 """"""""North Gondwanan Mid-Palaeozoic bioevent /biogeography patterns in relation to crustal dynamics"""""""" (led by R. Feist and J.A. Talent).展开更多
The problem of shore wash in environmental engineering is connected in particular with the effect of waves generated by the ships and fast speed boats. Another problem is protection of "Marines" with anchored boat a...The problem of shore wash in environmental engineering is connected in particular with the effect of waves generated by the ships and fast speed boats. Another problem is protection of "Marines" with anchored boat against waves. Sloping banks provoke unfavorable transformation of waves. Simultaneously sloping bank is the factor which significantly complicates prediction of wave pattern in numerical analysis. The purpose of present paper is to demonstrate the results of numerical investigation of ship waves pattern in constrain water area with slope banks by panel method for non-linear ship waves calculation usually applied for ship hull perfection as routine instrument of towing tanks technology. The method initially developed for calculation of ship hull waves in inviscid infinite fluid was adapted to meet boundary conditions on slope banks. Verification of the method was done for 60-series ship in rectangular channel. Development of wave pattern generated by two ship of different types--monohull ferries and river catamaran was investigated. It was found that ship waves height significantly increased due to slopping banks comparing with case of deep water and shallow water rectangular channel.展开更多
基金Supported by the 973 Projects under Grant(2002CB211706 and 2003 CB214608)
文摘In recent years, studies show that coal formed during marine transigression process is also important in coal accumulation basin. Still, the characteristics of coal formation is more clearly demonstrated by the coal formation in TST in the sequence stratigraphic framework. Based on the study of the characteristics of coal formation in epicontinental coal accumulation basin, the viewpoint that coal was formed under marine transgression was put forward by the authors and the mechenism thereof was also analyized. Marine transgression resulted in the forming of swamp and then the peat swamp. And the transgression later on put the peat formed in advance in deep water environment to form coal in the end. The important stratigraphic horrizons, such as coal seams, marine facies layers, formed with marine transgression are of the property of isochronism.
文摘During the last two decades research on the Devonian period was part of some successful IGCP projects, such as IGCP 216 """"""""Global biological events in Earth history"""""""" (led by O.H. Walliser), IGCP 335 """"""""Biotic recoveries from mass extinctions"""""""" (led by D.H.Erwin and E.G. Kauffman), and IGCP 421 """"""""North Gondwanan Mid-Palaeozoic bioevent /biogeography patterns in relation to crustal dynamics"""""""" (led by R. Feist and J.A. Talent).
文摘The problem of shore wash in environmental engineering is connected in particular with the effect of waves generated by the ships and fast speed boats. Another problem is protection of "Marines" with anchored boat against waves. Sloping banks provoke unfavorable transformation of waves. Simultaneously sloping bank is the factor which significantly complicates prediction of wave pattern in numerical analysis. The purpose of present paper is to demonstrate the results of numerical investigation of ship waves pattern in constrain water area with slope banks by panel method for non-linear ship waves calculation usually applied for ship hull perfection as routine instrument of towing tanks technology. The method initially developed for calculation of ship hull waves in inviscid infinite fluid was adapted to meet boundary conditions on slope banks. Verification of the method was done for 60-series ship in rectangular channel. Development of wave pattern generated by two ship of different types--monohull ferries and river catamaran was investigated. It was found that ship waves height significantly increased due to slopping banks comparing with case of deep water and shallow water rectangular channel.