The Suzhou Creek Sluice is currently the largest underwater plain gate in the world, with a single span of 100 m. It is located in a tidal estuary at the junction of the Huangpu River and Suzhou Creek in Shanghai, Chi...The Suzhou Creek Sluice is currently the largest underwater plain gate in the world, with a single span of 100 m. It is located in a tidal estuary at the junction of the Huangpu River and Suzhou Creek in Shanghai, China. In this study, physical and 2D vertical mathematical models were used to investigate and distinguish the mechanism of siltation downstream of an underwater plain gate from that of other gates types. According to quantitative data obtained by site investigation and the application of the physical hydrodynamic models, it was found that the characteristics of the tidal estuary as well as the fact that the sluice span is equal to the creek width are the major reasons contributing to siltation. A possible desiltation treatment system is proposed for the underwater plain gate. The system includes selection of a suitable location that allows the determination of a reasonable top elevation of the sluice floor, reserving sufficient space under the gate to accommodate siltation, setting up a mechanical desiltation system, and flushing silt along with overflow over the top of the gate. Furthermore, on-site hydraulic silt flushing experiments and a topography survey were conducted. These results showed that the measurement system is effective, and by maintaining this scheduled operation once a month, the downstream riverbed has been maintained in a good condition.展开更多
Contamination levels and distribution of seven synthetic musks in Suzhou Creek were investigated in this study. Two polycyclic musks, 1, 3, 4, 6, 7, 8-hexahydro-4, 6, 6, 7, 8, 8-hexamethylcyclopenta（g）-2-benzopyran ...Contamination levels and distribution of seven synthetic musks in Suzhou Creek were investigated in this study. Two polycyclic musks, 1, 3, 4, 6, 7, 8-hexahydro-4, 6, 6, 7, 8, 8-hexamethylcyclopenta（g）-2-benzopyran （HHCB） and 7-acetyl-1, 1, 1, 3, 4, 4, 6-hexamethyl-1, 2, 3, 4-tetrahydronaphthalene （AHTN）, were found in all samples. The ranges of HHCB and AHTN were from 8 ng/L to 138 ng/L and from 1 ng/L to 25 ng/L in surface waters, and from 2 ng/g to 77 ng/g （dry weight） and from 1 ng/g to 31 ng/g （dry weight） in sediments respectively. The total concentration of HHCB and AHTN showed obvious spatial change in surface waters： the upper reaches （suburb） 13 less than the lower course （urban area）; and in sediments, the musk levels were also higher in urban area. The distribution pattern also showed seasonaly varied characteristics both in surface waters and sediments. The distribution coefficient （Kp） and standardized distribution coefficient （Koc） were calculated through musk concentrations and octanol-water partition coefficient （Kow）. The results showed that AHTN was more easily absorbed in sediments. The adsorption of musk was increased with the increasing of total organic carbon （TOC） in Suzhou Creek. The significant positive correlation of HHCB and AHTN was found in this study, which indicated the same pollution source： the use and discharge of flavoring substances.展开更多
Water-quality models are important tools for improving river environment. In this paper, the project 'Water Quality Modeling of the Suzhou Creek' was briefly described, including the choice and the principle o...Water-quality models are important tools for improving river environment. In this paper, the project 'Water Quality Modeling of the Suzhou Creek' was briefly described, including the choice and the principle of the model, the model study and methods, the calibration and verification of the stream model. A set of parameters about water environmental characteristic of the Suzhou Creek were put forward in the period of the third water dispatch experiment in 1999. It is necessary to point out that these parameters will change with the rehabilitation and construction of the Suzhou Creek.展开更多
The Suzhou Creek is a seriously polluted tid-al river in Shanghai. The SuzhouCreek Rehabilitation Project was launched in 1998, and the total investment will surpass 10 billionyuan RMB. It is important to assess the e...The Suzhou Creek is a seriously polluted tid-al river in Shanghai. The SuzhouCreek Rehabilitation Project was launched in 1998, and the total investment will surpass 10 billionyuan RMB. It is important to assess the effectiveness of the project and ascertain its targets. Inthis study, by analyzing the achievements of Suzhou Creek Reha-bilitation Project (Stage Ⅰ) and itsremaining problems, the main tasks of the Project Stage Ⅱ are proposed. These works are wastewaterinterception, sediment dredging, bidirectional water diversion, and reconstruction of municipalpump stations. The water quality model established with USEPA''s WASP is employed to analyze thequantitative targets of the Project Stage Ⅱ. In the Project Stage Ⅱ, the water quality ofmainstream and tributaries will be improved continuously, the valus of COD_(Cr), BOD_5 , DO in themainstream will steadily attain Class Ⅳ according to the National Surface Water Quality Standard,and the ecological environment of Suzhou Creek with continuously recover.展开更多
文摘The Suzhou Creek Sluice is currently the largest underwater plain gate in the world, with a single span of 100 m. It is located in a tidal estuary at the junction of the Huangpu River and Suzhou Creek in Shanghai, China. In this study, physical and 2D vertical mathematical models were used to investigate and distinguish the mechanism of siltation downstream of an underwater plain gate from that of other gates types. According to quantitative data obtained by site investigation and the application of the physical hydrodynamic models, it was found that the characteristics of the tidal estuary as well as the fact that the sluice span is equal to the creek width are the major reasons contributing to siltation. A possible desiltation treatment system is proposed for the underwater plain gate. The system includes selection of a suitable location that allows the determination of a reasonable top elevation of the sluice floor, reserving sufficient space under the gate to accommodate siltation, setting up a mechanical desiltation system, and flushing silt along with overflow over the top of the gate. Furthermore, on-site hydraulic silt flushing experiments and a topography survey were conducted. These results showed that the measurement system is effective, and by maintaining this scheduled operation once a month, the downstream riverbed has been maintained in a good condition.
基金Project supported by the National Natural Science Foundation of China(Grant No.40872204)the National Basic Research Program of China(Grant No.2008CB418200)the Shanghai Leading Academic Discipline Project(Grant No.S30109)
文摘Contamination levels and distribution of seven synthetic musks in Suzhou Creek were investigated in this study. Two polycyclic musks, 1, 3, 4, 6, 7, 8-hexahydro-4, 6, 6, 7, 8, 8-hexamethylcyclopenta（g）-2-benzopyran （HHCB） and 7-acetyl-1, 1, 1, 3, 4, 4, 6-hexamethyl-1, 2, 3, 4-tetrahydronaphthalene （AHTN）, were found in all samples. The ranges of HHCB and AHTN were from 8 ng/L to 138 ng/L and from 1 ng/L to 25 ng/L in surface waters, and from 2 ng/g to 77 ng/g （dry weight） and from 1 ng/g to 31 ng/g （dry weight） in sediments respectively. The total concentration of HHCB and AHTN showed obvious spatial change in surface waters： the upper reaches （suburb） 13 less than the lower course （urban area）; and in sediments, the musk levels were also higher in urban area. The distribution pattern also showed seasonaly varied characteristics both in surface waters and sediments. The distribution coefficient （Kp） and standardized distribution coefficient （Koc） were calculated through musk concentrations and octanol-water partition coefficient （Kow）. The results showed that AHTN was more easily absorbed in sediments. The adsorption of musk was increased with the increasing of total organic carbon （TOC） in Suzhou Creek. The significant positive correlation of HHCB and AHTN was found in this study, which indicated the same pollution source： the use and discharge of flavoring substances.
文摘Water-quality models are important tools for improving river environment. In this paper, the project 'Water Quality Modeling of the Suzhou Creek' was briefly described, including the choice and the principle of the model, the model study and methods, the calibration and verification of the stream model. A set of parameters about water environmental characteristic of the Suzhou Creek were put forward in the period of the third water dispatch experiment in 1999. It is necessary to point out that these parameters will change with the rehabilitation and construction of the Suzhou Creek.
文摘The Suzhou Creek is a seriously polluted tid-al river in Shanghai. The SuzhouCreek Rehabilitation Project was launched in 1998, and the total investment will surpass 10 billionyuan RMB. It is important to assess the effectiveness of the project and ascertain its targets. Inthis study, by analyzing the achievements of Suzhou Creek Reha-bilitation Project (Stage Ⅰ) and itsremaining problems, the main tasks of the Project Stage Ⅱ are proposed. These works are wastewaterinterception, sediment dredging, bidirectional water diversion, and reconstruction of municipalpump stations. The water quality model established with USEPA''s WASP is employed to analyze thequantitative targets of the Project Stage Ⅱ. In the Project Stage Ⅱ, the water quality ofmainstream and tributaries will be improved continuously, the valus of COD_(Cr), BOD_5 , DO in themainstream will steadily attain Class Ⅳ according to the National Surface Water Quality Standard,and the ecological environment of Suzhou Creek with continuously recover.
