The turbulence mechanism plays an important part in the mixing process and momentum transfer of turbulence. A three-dimensional Prandtl mixing length tidal model has been developed to simulate tidal flows and water qu...The turbulence mechanism plays an important part in the mixing process and momentum transfer of turbulence. A three-dimensional Prandtl mixing length tidal model has been developed to simulate tidal flows and water quality. The eddy viscosities and diffusivities are computed from the Prandtl mixing length model. In order to model the water quality of an estuary or coastal area many interdependent processes need to be simulated. These may be conveniently separated into three main groups: transport and mixing processes, biochemical interaction of water quality variables and the utilization and re-cycling of nutrients by living matter. The model simulates full oxygen and nutrient balance, primary productivity and the transport, reaction mechanism and fate of pollutants over tidal time-scales. The model is applied to numerical simulation of tidal flows and water quality in Dalian Bay. The model has been calibrated against a limited data set of historical water quality observations and in general demonstrates excellent agreement with all available data.展开更多
Dalian Bay is a large coastal embayment situated in the Yellow Sea. The bay is heavily industrialised and the surrounding water they receives large amounts of industrial effluent. A numerical model of water quality in...Dalian Bay is a large coastal embayment situated in the Yellow Sea. The bay is heavily industrialised and the surrounding water they receives large amounts of industrial effluent. A numerical model of water quality in Dalian Bay has been developed to study the long-term transport and fate of pollutants in the system. In order to model the water quality of an estuary or coastal area many interdependent processes need to be simulated. These may be conveniently separated into three main groups: transport and mixing processes, biochemical interaction of water quality variables and the utilization and re-cycling of nutrients by living matter.The waters of Dalisn Bay are stratified due to the density variations resulting from the seasonal variations in meteorological conditions. In order to simulate the vertical structure of the hydrodynamics and pollutant transport in the bay the three-dimensional segmented and layered hydrodynamic model has been utilised. The results are used to drive the water quality model which simulates full oxygen and nutrient balance, primary productivity and the transport,reaction mechanism and fate of pollutants. The model has been used to study seasonal effects.The model has been calibrated against a limited data set of historical water quality observations and in general demonstrates excellent agreement with all available data.展开更多
针对川西南地区页岩气勘探面临的激发条件变化较大、地表障碍物较多和外界干扰较大等影响三维地震勘探资料采集质量的问题,研究团队经过多年研究与试验,设计了经济适用的细分面元复合模板观测系统,从3个方面针对性制定了质量提升措施。...针对川西南地区页岩气勘探面临的激发条件变化较大、地表障碍物较多和外界干扰较大等影响三维地震勘探资料采集质量的问题,研究团队经过多年研究与试验,设计了经济适用的细分面元复合模板观测系统,从3个方面针对性制定了质量提升措施。(1)分析影响激发的主要因素,开展全工区系统试验,优化工区不同位置激发参数,确定适宜的炮井井深和炸药用量等措施优化激发参数;(2)确定煤矿、河流、水库、城镇等地表障碍物分布区域,细化观测系统方案,减少丢炮、丟道面积;(3)做实检波器埋置,控制人文和自然环境噪音,提升接收质量。一系列措施落实后,地震资料的采集质量显著提升,所采集的JY三维工区的原始单炮记录一级品率大于90%,PSTM(Pre stack time migration,叠前时间偏移)处理成果剖面具有较高的信噪比、分辨率和较强的层次感,对页岩气勘探开发具有重要支撑作用。展开更多
基金The project is supported by The National Natural Science Foundation of China
文摘The turbulence mechanism plays an important part in the mixing process and momentum transfer of turbulence. A three-dimensional Prandtl mixing length tidal model has been developed to simulate tidal flows and water quality. The eddy viscosities and diffusivities are computed from the Prandtl mixing length model. In order to model the water quality of an estuary or coastal area many interdependent processes need to be simulated. These may be conveniently separated into three main groups: transport and mixing processes, biochemical interaction of water quality variables and the utilization and re-cycling of nutrients by living matter. The model simulates full oxygen and nutrient balance, primary productivity and the transport, reaction mechanism and fate of pollutants over tidal time-scales. The model is applied to numerical simulation of tidal flows and water quality in Dalian Bay. The model has been calibrated against a limited data set of historical water quality observations and in general demonstrates excellent agreement with all available data.
文摘Dalian Bay is a large coastal embayment situated in the Yellow Sea. The bay is heavily industrialised and the surrounding water they receives large amounts of industrial effluent. A numerical model of water quality in Dalian Bay has been developed to study the long-term transport and fate of pollutants in the system. In order to model the water quality of an estuary or coastal area many interdependent processes need to be simulated. These may be conveniently separated into three main groups: transport and mixing processes, biochemical interaction of water quality variables and the utilization and re-cycling of nutrients by living matter.The waters of Dalisn Bay are stratified due to the density variations resulting from the seasonal variations in meteorological conditions. In order to simulate the vertical structure of the hydrodynamics and pollutant transport in the bay the three-dimensional segmented and layered hydrodynamic model has been utilised. The results are used to drive the water quality model which simulates full oxygen and nutrient balance, primary productivity and the transport,reaction mechanism and fate of pollutants. The model has been used to study seasonal effects.The model has been calibrated against a limited data set of historical water quality observations and in general demonstrates excellent agreement with all available data.
文摘针对川西南地区页岩气勘探面临的激发条件变化较大、地表障碍物较多和外界干扰较大等影响三维地震勘探资料采集质量的问题,研究团队经过多年研究与试验,设计了经济适用的细分面元复合模板观测系统,从3个方面针对性制定了质量提升措施。(1)分析影响激发的主要因素,开展全工区系统试验,优化工区不同位置激发参数,确定适宜的炮井井深和炸药用量等措施优化激发参数;(2)确定煤矿、河流、水库、城镇等地表障碍物分布区域,细化观测系统方案,减少丢炮、丟道面积;(3)做实检波器埋置,控制人文和自然环境噪音,提升接收质量。一系列措施落实后,地震资料的采集质量显著提升,所采集的JY三维工区的原始单炮记录一级品率大于90%,PSTM(Pre stack time migration,叠前时间偏移)处理成果剖面具有较高的信噪比、分辨率和较强的层次感,对页岩气勘探开发具有重要支撑作用。
