Laiyang formation of Jiaolai Basin is the target stratum for oil and gas exploration. By measuring several field sections, the authors find that Laiyang formation reveals the whole processes from development to death ...Laiyang formation of Jiaolai Basin is the target stratum for oil and gas exploration. By measuring several field sections, the authors find that Laiyang formation reveals the whole processes from development to death of the lake basin and its sedimentary facies differ in different structural locations. Analyses about sedimentary facies and paleocurrent orientations in association with researches about the positive tectonic units such as Dayetou horseback and Chaigou horst indicate that Laiyang sag is a relatively independent sedimentary unit that shows great water depth typical of deep lake or semideep lake and was controlled by Wulongcun fault during the deposition period of Laiyang formation. Its sediments mainly originated from Jiaobei uplift area and Dayetou horseback. Gaomi-Zhucheng sag was a fast-filled basin controlled by Wurong fault and Yishu fault zone, being high in the northeast and low in the northwest and characterized by the development of pluvial facies and fluvial facies in most areas, and with the development of lake facies being limited to local low-lying regions. Selection of advantageous hydrocarbon reservoir areas for exploration purpose mainly relies on the sedimentation pattern of prototype basin and conservation conditions. The central-west area of Laiyang sag covered by overlying Laiyang formation is the most advantageous exploration area.展开更多
A dam failure analysis was performed for the City of Laiyang to determine the flood inundation extents and the breach velocities of a hypothetical failure of the Muyu Reservoir Dam in Shandong Province, China. The stu...A dam failure analysis was performed for the City of Laiyang to determine the flood inundation extents and the breach velocities of a hypothetical failure of the Muyu Reservoir Dam in Shandong Province, China. The study was carried out in four steps. First, the possible reasons of the dam failure were analyzed, and the extreme hydrological event was identified as the most critical cause Second, a numerical simulation of the dam break flood was performed. The key factors considered in this simulation include the water level at the dam （the check flood water level）, the inflow to the reservoir （the check flood hydrograph）, and two typical structural scenarios （with/without-levees） along the river reach downstream of the reservoir. Third, based on flood simulations, flood hazard risk analysis was conducted and the results indicate that the peak discharge would be over 40,000 m3/s at the breachand over 22,000 m3/s near Laiyang City. As a result, most of the urban area would be flooded; the duration from the beginning of the dam break to the arrival of peak discharge at Laiyang City is less than half an hour. Finally, a plan for integrated dam break flood management was presented to mitigate the flood risk; both available structural and nonstructural measures were proposed according to the situations in the river basin. The main strategic advises include flood emergency planning, flood risk mapping, flood monitoring and early warning system construction, reservoir regulation, and flood risk public awareness.展开更多
The 2019 Laiyang Pear Blossoms Festival is underway from April 13 to April 23 in Laiyang,East China’s Shandong province, offering splendid views of pear blossoms.Laiyang, a county-level city in Yantai, is famed in Ch...The 2019 Laiyang Pear Blossoms Festival is underway from April 13 to April 23 in Laiyang,East China’s Shandong province, offering splendid views of pear blossoms.Laiyang, a county-level city in Yantai, is famed in China for its sweet juicy pears and has held the pear blossom festival for 28 years. The annual festival has become an important way for Laiyang to promote its pear culture and featured products.展开更多
文摘Laiyang formation of Jiaolai Basin is the target stratum for oil and gas exploration. By measuring several field sections, the authors find that Laiyang formation reveals the whole processes from development to death of the lake basin and its sedimentary facies differ in different structural locations. Analyses about sedimentary facies and paleocurrent orientations in association with researches about the positive tectonic units such as Dayetou horseback and Chaigou horst indicate that Laiyang sag is a relatively independent sedimentary unit that shows great water depth typical of deep lake or semideep lake and was controlled by Wulongcun fault during the deposition period of Laiyang formation. Its sediments mainly originated from Jiaobei uplift area and Dayetou horseback. Gaomi-Zhucheng sag was a fast-filled basin controlled by Wurong fault and Yishu fault zone, being high in the northeast and low in the northwest and characterized by the development of pluvial facies and fluvial facies in most areas, and with the development of lake facies being limited to local low-lying regions. Selection of advantageous hydrocarbon reservoir areas for exploration purpose mainly relies on the sedimentation pattern of prototype basin and conservation conditions. The central-west area of Laiyang sag covered by overlying Laiyang formation is the most advantageous exploration area.
文摘A dam failure analysis was performed for the City of Laiyang to determine the flood inundation extents and the breach velocities of a hypothetical failure of the Muyu Reservoir Dam in Shandong Province, China. The study was carried out in four steps. First, the possible reasons of the dam failure were analyzed, and the extreme hydrological event was identified as the most critical cause Second, a numerical simulation of the dam break flood was performed. The key factors considered in this simulation include the water level at the dam （the check flood water level）, the inflow to the reservoir （the check flood hydrograph）, and two typical structural scenarios （with/without-levees） along the river reach downstream of the reservoir. Third, based on flood simulations, flood hazard risk analysis was conducted and the results indicate that the peak discharge would be over 40,000 m3/s at the breachand over 22,000 m3/s near Laiyang City. As a result, most of the urban area would be flooded; the duration from the beginning of the dam break to the arrival of peak discharge at Laiyang City is less than half an hour. Finally, a plan for integrated dam break flood management was presented to mitigate the flood risk; both available structural and nonstructural measures were proposed according to the situations in the river basin. The main strategic advises include flood emergency planning, flood risk mapping, flood monitoring and early warning system construction, reservoir regulation, and flood risk public awareness.
文摘The 2019 Laiyang Pear Blossoms Festival is underway from April 13 to April 23 in Laiyang,East China’s Shandong province, offering splendid views of pear blossoms.Laiyang, a county-level city in Yantai, is famed in China for its sweet juicy pears and has held the pear blossom festival for 28 years. The annual festival has become an important way for Laiyang to promote its pear culture and featured products.
