Long-term changes of fish biotic integrity in the Sanmenxia Wetland,North China,since the 1950 s were assessed using the fish index of biological integrity（FIBI）. The water and sediment quality was evaluated by the ...Long-term changes of fish biotic integrity in the Sanmenxia Wetland,North China,since the 1950 s were assessed using the fish index of biological integrity（FIBI）. The water and sediment quality was evaluated by the water quality index（WQI） and sediment pollution index（SPI）. The results showed that FIBI continuously decreased from 46 to 20 during the past 5 decades,which indicated that the fish community state shifted from fair to very poor conditions,and damming by itself did not affect the fish biotic integrity. At the same time,WQI fell from 83 to 44.1,and SPI increased from 0.99 to 2.14 since the 1960 s,resulting from fast regional socio-economic development and insufficient wastewater treatment. Correlation analysis suggested that water quality significantly affected biotic integrity（r = 0.867,p 〈 0.05） through direct effects on the fish community. As a representative example of many wetlands in North China,our study clearly demonstrated that the biological integrity was degraded,induced both by water quality deterioration and sediment pollution,further driven by the contradiction between rapid development of regional economy and lagging development of sewage treatment facilities,which were thought to be the main factor responsible for the degradation of biological integrity.展开更多
The problem of water pollution is one of the long-term difficulties in the process of rural environmental construction and economic development in China.In order to meet the requirements of the country’s green and su...The problem of water pollution is one of the long-term difficulties in the process of rural environmental construction and economic development in China.In order to meet the requirements of the country’s green and sustainable development,many regions actively promote the construction of rural sewage treatment and fill in the shortcomings of the rural habitat environment to accelerate the construction of beautiful and livable villages.Through a lot of literature and case studies,this paper explores the environmental problems that are common in rural sewage treatment in the northern region of China,explores advanced domestic and foreign cases and technologies on this topic,and summarizes the landscape design strategies on this issue.From the perspective of ecological landscape design,the thesis seeks the theoretical and technical support for rural sewage treatment in river valley areas,and establishes a bridge between rural sewage treatment technology and ecological landscape.Finally,combining theory with practice,taking the project of Lushi sewage treatment in Sanmenxia as an example,team completed the landscape design of ecological sewage purification display area in Zhangjiacun.The design focuses on presenting the application of internal sewage treatment technology and external landscape aesthetics.According to the main points of ecological landscape design and the theory of ecological edge effect,the local ecological system is effectively protected,and a rural domestic sewage purification display area with economic benefits is constructed.展开更多
The Caocun （曹村） loess profile of Zhangbianyuan （张汴塬） is located at the southeast margin of the Loess Plateau, which is a typical representative of loess stratum in the Sanmenxia （三门峡） area. In the 145 m ...The Caocun （曹村） loess profile of Zhangbianyuan （张汴塬） is located at the southeast margin of the Loess Plateau, which is a typical representative of loess stratum in the Sanmenxia （三门峡） area. In the 145 m thick profile, a Ioess-paleosol sequence occurs from L1 to L33, underlain by a red clay bed. The B/M boundary was recorded at the bottom of L7, the Jarumillo event at S11 to S12, the Olduval event at L23 to L26, and the M/G boundary at the bottom of L33 near the red clay. The magnetic susceptibility of the loess deposits, as well as the carbonate and granularity components, indicates that there have been many periodic paleoclimate changes, including a total of 13 cold events that each lasted more than 40 000 a. A high-resolution chronostratigraphic profile has been established using an age model according to grain characteristics. A clear correlation exists between records of the paleomonsoon in the Caocun loess succession and SPECMAP from 3 × 10^5 a B. P. to the present. The Caocun profile can act as a control site in the southeastern Loess Plateau. Its paleoenvironmental records relate to eastern Asian paleomonsoon theory.展开更多
On April 23rd, China Datang Corporation and EdF ofFrance held a signing ceremony for a joint-venture contractof Datang Sanmenxia Power Generation Company Ltd.in Henan Province. This is the first cooperation projectbet...On April 23rd, China Datang Corporation and EdF ofFrance held a signing ceremony for a joint-venture contractof Datang Sanmenxia Power Generation Company Ltd.in Henan Province. This is the first cooperation projectbetween Datang and EdF.The Datang Sanmenxia Power Generation展开更多
Sanmenxia Gorge on the Yellow River is one of the cradles of the Chinese nation. With its vast number of natural and human landscapes, cultural relics and sites, it is a fitting place to learn about China’s ancient c...Sanmenxia Gorge on the Yellow River is one of the cradles of the Chinese nation. With its vast number of natural and human landscapes, cultural relics and sites, it is a fitting place to learn about China’s ancient civilization and modern miracles.展开更多
LOCATED by the Yellow River in the west of Henan Province. the city of Sanmenxia sits at the juncture of Henan. Shanxi and Shaanxi provinces. The name of Sanmenxia (Three-Gate Gorge, in Chinese) derives from a beautif...LOCATED by the Yellow River in the west of Henan Province. the city of Sanmenxia sits at the juncture of Henan. Shanxi and Shaanxi provinces. The name of Sanmenxia (Three-Gate Gorge, in Chinese) derives from a beautiful ancient story about a magic axe that could carve out rivers and watercourses. In remote antiquity, a legendary hero named Da Yu was supposed to have tunneled the Dragon Gate, set up a whetstone and cut展开更多
This paper presents a study of the variation of the elevation of Tongguan, which is located in the backwater zone of the Sanmenxia Reservoir, in response to changes in flow runoff. The analysis indicated that the rise...This paper presents a study of the variation of the elevation of Tongguan, which is located in the backwater zone of the Sanmenxia Reservoir, in response to changes in flow runoff. The analysis indicated that the rise of the eleva- tion of Tongguan, which is defined as the stage corresponding to a discharge of 1000 m3/s at Tongguan station, is controlled by the stream energy. A close relationship existed between the elevation of Tongguan and the superimposed stream en- ergy that integrates the current and the preceding years’ flow and dam operation conditions. When the flow runoff remains relatively constant and the pool level of the dam has a rela- tively large range of variations, then the elevation of Tong- guan is primarily controlled by the dam operation conditions. On the other hand, if the flow runoff has a relatively large range of variations and the pool level of the dam remains relatively constant, then the elevation of Tongguan is primar- ily controlled by the flow conditions. These findings are of importance for optimizing the dam operation in order to lower and control the elevation of Tongguan, and therefore to minimize the backwater effect of the dam operation.展开更多
基金supported by the Research & Development on Suitable Key Technologies of the Village Environmental Monitoring (No.2012BAJ24B01)
文摘Long-term changes of fish biotic integrity in the Sanmenxia Wetland,North China,since the 1950 s were assessed using the fish index of biological integrity（FIBI）. The water and sediment quality was evaluated by the water quality index（WQI） and sediment pollution index（SPI）. The results showed that FIBI continuously decreased from 46 to 20 during the past 5 decades,which indicated that the fish community state shifted from fair to very poor conditions,and damming by itself did not affect the fish biotic integrity. At the same time,WQI fell from 83 to 44.1,and SPI increased from 0.99 to 2.14 since the 1960 s,resulting from fast regional socio-economic development and insufficient wastewater treatment. Correlation analysis suggested that water quality significantly affected biotic integrity（r = 0.867,p 〈 0.05） through direct effects on the fish community. As a representative example of many wetlands in North China,our study clearly demonstrated that the biological integrity was degraded,induced both by water quality deterioration and sediment pollution,further driven by the contradiction between rapid development of regional economy and lagging development of sewage treatment facilities,which were thought to be the main factor responsible for the degradation of biological integrity.
文摘The problem of water pollution is one of the long-term difficulties in the process of rural environmental construction and economic development in China.In order to meet the requirements of the country’s green and sustainable development,many regions actively promote the construction of rural sewage treatment and fill in the shortcomings of the rural habitat environment to accelerate the construction of beautiful and livable villages.Through a lot of literature and case studies,this paper explores the environmental problems that are common in rural sewage treatment in the northern region of China,explores advanced domestic and foreign cases and technologies on this topic,and summarizes the landscape design strategies on this issue.From the perspective of ecological landscape design,the thesis seeks the theoretical and technical support for rural sewage treatment in river valley areas,and establishes a bridge between rural sewage treatment technology and ecological landscape.Finally,combining theory with practice,taking the project of Lushi sewage treatment in Sanmenxia as an example,team completed the landscape design of ecological sewage purification display area in Zhangjiacun.The design focuses on presenting the application of internal sewage treatment technology and external landscape aesthetics.According to the main points of ecological landscape design and the theory of ecological edge effect,the local ecological system is effectively protected,and a rural domestic sewage purification display area with economic benefits is constructed.
基金This paper is supported by the China Geological Survey(No.200312300034)and the Ministry of Land and Resources of China(No.20010209).
文摘The Caocun （曹村） loess profile of Zhangbianyuan （张汴塬） is located at the southeast margin of the Loess Plateau, which is a typical representative of loess stratum in the Sanmenxia （三门峡） area. In the 145 m thick profile, a Ioess-paleosol sequence occurs from L1 to L33, underlain by a red clay bed. The B/M boundary was recorded at the bottom of L7, the Jarumillo event at S11 to S12, the Olduval event at L23 to L26, and the M/G boundary at the bottom of L33 near the red clay. The magnetic susceptibility of the loess deposits, as well as the carbonate and granularity components, indicates that there have been many periodic paleoclimate changes, including a total of 13 cold events that each lasted more than 40 000 a. A high-resolution chronostratigraphic profile has been established using an age model according to grain characteristics. A clear correlation exists between records of the paleomonsoon in the Caocun loess succession and SPECMAP from 3 × 10^5 a B. P. to the present. The Caocun profile can act as a control site in the southeastern Loess Plateau. Its paleoenvironmental records relate to eastern Asian paleomonsoon theory.
文摘On April 23rd, China Datang Corporation and EdF ofFrance held a signing ceremony for a joint-venture contractof Datang Sanmenxia Power Generation Company Ltd.in Henan Province. This is the first cooperation projectbetween Datang and EdF.The Datang Sanmenxia Power Generation
文摘Sanmenxia Gorge on the Yellow River is one of the cradles of the Chinese nation. With its vast number of natural and human landscapes, cultural relics and sites, it is a fitting place to learn about China’s ancient civilization and modern miracles.
文摘LOCATED by the Yellow River in the west of Henan Province. the city of Sanmenxia sits at the juncture of Henan. Shanxi and Shaanxi provinces. The name of Sanmenxia (Three-Gate Gorge, in Chinese) derives from a beautiful ancient story about a magic axe that could carve out rivers and watercourses. In remote antiquity, a legendary hero named Da Yu was supposed to have tunneled the Dragon Gate, set up a whetstone and cut
文摘This paper presents a study of the variation of the elevation of Tongguan, which is located in the backwater zone of the Sanmenxia Reservoir, in response to changes in flow runoff. The analysis indicated that the rise of the eleva- tion of Tongguan, which is defined as the stage corresponding to a discharge of 1000 m3/s at Tongguan station, is controlled by the stream energy. A close relationship existed between the elevation of Tongguan and the superimposed stream en- ergy that integrates the current and the preceding years’ flow and dam operation conditions. When the flow runoff remains relatively constant and the pool level of the dam has a rela- tively large range of variations, then the elevation of Tong- guan is primarily controlled by the dam operation conditions. On the other hand, if the flow runoff has a relatively large range of variations and the pool level of the dam remains relatively constant, then the elevation of Tongguan is primar- ily controlled by the flow conditions. These findings are of importance for optimizing the dam operation in order to lower and control the elevation of Tongguan, and therefore to minimize the backwater effect of the dam operation.
