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Wave Height Distribution for Spilling Waves in and outside the Surf Zone 被引量:1
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作者 赵子丹 游涛 时钟 《Transactions of Tianjin University》 EI CAS 2005年第5期365-370,共6页
The wave characteristics affecting coastal sediment transport include wave height, wave period and breaking wave direction. Wave height is a critical factor in determining the amount of sediment transport in the coast... The wave characteristics affecting coastal sediment transport include wave height, wave period and breaking wave direction. Wave height is a critical factor in determining the amount of sediment transport in the coastal area. The force of sediment transport is much more intense under breaking waves than under non-breaking waves. Breaking waves exhibit various patterns, principal- ly depending on the incident wave steepness and the beach slope. Based on the equations of con- servation of mass, momentum and energy, a theoretical model for wave deformation in and outside the surf zone was obtained, which is used to calculate the wave shoaling, wave set-up and set- down and wave height distributions in and outside the surf zone. The analysis and comparison were made about the breaking point location and the wave height decay caused by the wave breaking and the bottom friction. Flume experiments relating to the spilling wave height distribution across the surf zone were conducted to verify the theoretical model. Advanced wave maker, data sampling de- vices and data processing system were utilized in the flume experiments with a slope covered by sands of different diameters to facilitate the observation and research on the wave transformation and breaking. The agreement between the theoretical and experimental results is good. 展开更多
关键词 surf zone wave height distribution flume experiment spilling waves
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Distribution of recent Ostracoda from the coastal zone of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi
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作者 Ruan Peihua China University of Geosciences, Chengfu Road, Beijing, China 《Acta Oceanologica Sinica》 SCIE CAS CSCD 1990年第1期119-134,共16页
-This paper deals with the recent ostracods and their distribution in littora! zones. The ostracods studied in this paper are all from the coastal zones of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi... -This paper deals with the recent ostracods and their distribution in littora! zones. The ostracods studied in this paper are all from the coastal zones of Gaode and Weizhou Island, Zhuang Autonomous Region of Guangxi. The present study shows that the richness and diversity of the ostracods from Gaode area are rather lower as compared with those from Weizhou Island, where individual numbers increase constantly from supralittoral to sublittoral zones. The ostracod associations of Weizhou Island are similar to those reported from the east coast of the Weizhou Island, and most of them are littoral and benthic forms of the order Podocopida and only a few of them are members of the order Myodocopoda (e. g. Ruti-derma, Cylindroleberis and Polycope). In this paper, the distributive character of the ostracods in the studied areas is analysed and discussed synthetically on the ground of their ecology, which will provide new information for the study of ecologic habitats, biogeographic provinciality and the Cenozoic biostratigraphy of ostracods. 展开更多
关键词 VIEW Zhuang Autonomous Region of Guangxi distribution of recent Ostracoda from the coastal zone of Gaode and Weizhou Island
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A public Cloud-based China's Landslide Inventory Database(Cs LID): development, zone, and spatiotemporal analysis for significant historical events, 1949-2011 被引量:5
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作者 LI Wei-yue LIU Chun +9 位作者 HONG Yang ZHANG Xin-hua WAN Zhan-ming Manabendra SAHARIA SUN Wei-wei YAO Dong-jing CHEN Wen CHEN Sheng YANG Xiu-qin YUE Jing 《Journal of Mountain Science》 SCIE CSCD 2016年第7期1275-1285,共11页
Landslide inventory plays an important role in recording landslide events and showing their temporal-spatial distribution. This paper describes the development, visualization, and analysis of a China's Landslide I... Landslide inventory plays an important role in recording landslide events and showing their temporal-spatial distribution. This paper describes the development, visualization, and analysis of a China's Landslide Inventory Database(Cs LID) by utilizing Google's public cloud computing platform. Firstly, Cs LID(Landslide Inventory Database) compiles a total of 1221 historical landslide events spanning the years 1949-2011 from relevant data sources. Secondly, the Cs LID is further broken down into six zones for characterizing landslide cause-effect, spatiotemporal distribution, fatalities, and socioeconomic impacts based on the geological environment and terrain. The results show that among all the six zones, zone V, located in Qinba and Southwest Mountainous Area is the most active landslide hotspot with the highest landslide hazard in China. Additionally, the Google public cloud computing platform enables the Cs LID to be easily accessible, visually interactive, and with the capability of allowing new data input to dynamically augment the database. This work developed a cyber-landslide inventory and used it to analyze the landslide temporal-spatial distribution in China. 展开更多
关键词 Landslide Inventory zone distribution Cloud computing
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CFD simulation of spontaneous coal combustion in irregular patterns of goaf with multiple points of leaking air 被引量:4
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作者 LI Zong-xiang 《Journal of China University of Mining and Technology》 EI 2008年第4期504-508,515,共6页
Based on the non-linear air leakage seepage equation for an anisotropic porous medium, on the seepage diffusion equation of multicomponent gas and on the seepage synthetic heat transfer equation of a porous medium, th... Based on the non-linear air leakage seepage equation for an anisotropic porous medium, on the seepage diffusion equation of multicomponent gas and on the seepage synthetic heat transfer equation of a porous medium, the numerical model for field flow problems of irregular patterns of a goaf with multiple points of leaking air is established and simultaneously solved by the upwind mode finite element method (G3 computer program). According to the complexity of irregular patterns of a goaf with multiple points of leaking air, the flow pattern in a large area of such a goaf and the variation in gases of methane, oxygen and CO and in temperature are theoretically described. In the calculation, the goaf is regarded as a caving anisotropic medium and the coupling effect of methane effusion on spontaneous combustion is considered. The simulation results agree well with practical experience. In addition, the spontaneous combustion process is also simulated, indicating that 1) the spontaneous combustion often takes place near the area where fresh air leaks in and 2) the fire sources can be classified into static and dynamic zones. Therefore, in practical fire preventing and extinguishing, we should clearly distinguish the upstream air leaking points from the downstream ones in order to take proper measures for leakage stopping. 展开更多
关键词 irregular pattern of goaf multi-points of air leaking spontaneous combustion temperature field fire zone distribution pressure balance
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Sorption and phase distribution of ethanol and butanol blended gasoline vapours in the vadose zone after release 被引量:2
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作者 Ejikeme Ugwoha John M. Andresen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第3期608-616,共9页
The sorption and phase distribution of 20% ethanol and butanol blended gasoline (E20 and B20) vapours have been examined in soils with varying soil organic matter (SOM) and water contents via laboratory microcosm ... The sorption and phase distribution of 20% ethanol and butanol blended gasoline (E20 and B20) vapours have been examined in soils with varying soil organic matter (SOM) and water contents via laboratory microcosm experiments. The presence of 20% alcohol reduced the sorption of gasoline compounds by soil as well as the mass distribution of the compounds to soil solids. This effect was greater for ethanol than butanol. Compared with the sorption coefficient (Kd) of unblended gasoline compounds, the Kd of E20 gasoline compounds decreased by 54% for pentane, 54% for methylcyclopentane (MCP) and 63% for benzene, while the Kd of B20 gasoline compounds decreased by 39% for pentane, 38% for MCP and 49% for benzene, The retardation factor (R) of E20 gasoline compounds decreased by 53% for pentane, 53% for MCP and 48% for benzene, while the R of B20 gasoline compounds decreased by 39% for pentane, 37% for MCP and 38% for benzene. For all SOM and water contents tested, the Kd and R of all gasoline compounds were in the order of unblended gasoline 〉 B20 〉 E20, indicating that the use of high ethanol volume in gasoline to combat climate change could put the groundwater at greater risk of contamination, 展开更多
关键词 butanol-blended gasoline ethanol-blended gasoline phase distribution soil organic matter soil water content sorption vadose zone
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Reservoirs Patterns and Key Controlling Factors of the Lenghu Oil & Gas Field in the Qaidam Basin, Northwestern China 被引量:1
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作者 Wengang He Ehsan Barzgar +1 位作者 Weiping Feng Liang Huang 《Journal of Earth Science》 SCIE CAS CSCD 2021年第4期1011-1021,共11页
The Lenghu area is one of the most crucial tectonic belts for oil and gas exploration in the Qaidam Basin.However,reservoir distribution and the factors controlling petroleum accumulation in this area have not been st... The Lenghu area is one of the most crucial tectonic belts for oil and gas exploration in the Qaidam Basin.However,reservoir distribution and the factors controlling petroleum accumulation in this area have not been studied in detail.In this paper,the structural characteristics and controlling factors of oil and gas accumulation in the Lenghu belt are investigated based on seismic profiles combined with drilling logs and microphotographs data.Results indicate that the Lenghu belt has thick source rocks and has preserved hydrocarbon generation conditions.Moreover,structural characteristics and lithology are the key factors controlling the reservoir distribution.The production of oil and gas layers are mainly distributed in high structural points and weak stress zones.The fracture zones and the weak stress zones are the potential places for the distribution of oil and gas reservoirs. 展开更多
关键词 Lenghu belt reservoir patterns controlling factor potential distribution zones
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