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High resolution records of flood deposition in the mud area off the changjiang river mouth during the past century

Chinese Journal of Oceanology and Limnology 2014年第4期32卷 909-920页

作者：胡刚李安春刘健徐刚梅西孔祥淮 Key Lab of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Key Lab of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources University of Chinese Academy of Sciences

This paper presents a paleoflood study to determine the flood frequency of the changjiang river, based on core cj0702, taken from the changjiang river subaqueous delta. We identified flood deposits by means of high-resolution grain-size variation, sensitive population, geochemical indexes and magnetic susceptibility. The core covers a time span of 120 years by 21~pb dating and was sampled at 1-2 cm intervals. Grain size, geochemical elements, and physical parameters were analyzed. The results indicate that the sediment of the core is mainly composed of silt and clay, as well as groups of interbedded silt, clay silt, and clay. Vertically, the grain size pattern was controlled by seasonal variations in water discharge and by the sediment input in winter from the abandoned Huanghe river delta. river flooding caused extreme values in all our measured parameters. We identified more than 20 flood events that occurred since 1887 using the physical parameter analysis method. The environmentally sensitive component of sediment grain size （14.32-96.39 gm） contribution〉30%, Zr/Rb ratio〉l.5, and magnetic susceptibility〉16 were selected as the criteria for flood identification generally. We also found that floods that had taken place in the upstream, midstream, or downstream parts of the river were clearly identified by these indexes while the large-scale floods that covered the whole drainage area did not leave clear indications in the sediment record. This study for identification of flood events is of great significance for understanding hyperpycnal current sedimentation as well as for forecasting of floods.

关键词： high resolution grain size flood deposition mud area the changjiang river

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Water discharge changes of the changjiang river downstream Datong during dry season

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Journal of Geographical Sciences 2003年第3期13卷 355-362页

作者： ZHANG Erfeng,CHEN Xiqing,WANG Xiaoli(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China) State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China

Based on hydrometric data and extensive investigations on water-extracting projects, this paper presents a preliminary study on water discharge changes between Datong and Xuliujing during dry season. The natural hydrological processes and human factors that influence the water discharge are analyzed with the help of GIS method. The investigations indicate that the water-extracting projects downstream from Datong to Xuliujing had amounted to 64 in number by the end of 2000, with a water-extracting capacity up to 4,626 m 3 /s averaged in a tidal cycle. The water extraction from the changjiang river has become the most important factor influencing the water discharge downstream Datong during dry season. The potential magnitude in water discharge changes are estimated based on historical records of water extraction and a water balance model. The computational results were calibrated with the actual data. The future trend in changes of water discharge into the sea during dry season was discussed by taking into consideration of newly built hydro-engineering projects. The water extraction downstream Datong in dry season before 2000 had a great influence on discharges into the sea in the extremely dry year like 1978-1979. It produced a net decrease of more than 490 m 3 /s in monthly mean discharges from the changjiang into the sea. It is expected that the water extraction will continually increase in the coming decades, especially in dry years, when the net decrease in monthly mean water discharge will increase to more than 1000 m 3 /s and will give a far-reaching effect on the changes of water discharge from the changjiang into the sea.

关键词： the changjiang river dry season water discharge into the sea human impacts

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Bacterioplankton production in dilution zone of the changjiang (Yangtze) Estuary

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Acta Oceanologica Sinica 2001年第1期20卷 131-139页

作者： Liu Zilin 1,2 , Koshikawa Hiroshi 3, Ning Xiuren 1,2 , Shi Junxian 2, Cai Yuming 1,21.KeyLaboratoryofSubmarineGeosciences,StateOceanicAdministration,China2.SecondInstituteofOceanography,StateOceanicAdministration,Hangzhou310012,China3.Nationa Key Lab. of Submarine Geosciences State Oceanic Administration China Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China National Institute for Environmental Studies Tsukuba 305-0053 Japan

The bacterioplankton production and bacterioplankton abundance were surveyed in dilution zone of the changjiang Estuary and a mesocosm experimental device for enriched phosphate experiment and oil contaminated experiment was placed in the waters nearby Luhua Island during October 1997 and May 1998. The results showed that the average bacterioplankton production in spring was higher than that in autumn, the production at the surface water was higher than that at the bottom in the surveyed area; the higher values appeared in the middle of the area. The results from mesocosm experiment with adding phosphate and oil contaminated showed that the bacterioplankton production increased rising trend day by day during the experiment period.

关键词： Bacterioplankton production estuary the changjiang river

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21世纪前半叶长江流域水能开发

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人民长江 2001年第S1期32卷 23-28页

作者： QIU Zhong-en Professor Design Institute Changjiang Water Resources Commission

the changjiang river Valley is rich in hydraulic energy resources. A r ough estimation of the technically developable volume and the economically devel opable volume for the changjiang river Valley was drawn out on the basis of new data. According to the estimation, the developable water energy resources of the whole valley is 257 627.60 MW with an annual energy output of 1 195.142 billion kW *h - respectively amounting to 120.6% and 116.3% of the General Investigation resu lt in 1980. The proportion of economically developable volume in the technically devel opable volume ranges the medium level in the world. According to the 3-step plan for the national economic and social development, the economic situation of our country will come up to the standard of medium-developed countries in the mid of the 21st century. Calculation reports from related departments show that the na tional electric power requirement in the Year 2050 will be 6 200 billion kW*h ( basic scheme) ～11 600 billion kW*h (ideal scheme) while the electric power req u irement of the South-west, Central and East areas of the nation within the Chang jiang river Valley will amount to 44% ～ 50 %. In order to satisfy the electric p ower requirement of the national economic and social development, the developmen t and utilization of the hydraulic energy in the changjiang river Valley should be speeded up by stressing its strategic position and taking effective m easures. T he structure of the electric energy components of the three areas will be improv ed with the increasing proportion of the hydroelectricity. The hydroelectricity should be mainly developed in the South-west area; both the hydroelectric and fossil-f ired power should be developed in the Central China; the fossil-fired power shou ld be mainly developed in the combination of hydropower while nuclear po wer w ill be properly developed in the East China. In the Year 2050, the development o f the economically developable hydraulic energy in the

关键词：长江流域 the changjiang river energy resources electric energy electric power power requirement Central China East China the world

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changjiang WATER RESOURCES COMMISSION IN BRIEF

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人民长江 2001年第S1期32卷 61-62页

The changjiang Water Resources Commission（CWRC）， originally named Yangtze Valley Planning Office（YVPO）， was established in February， 1950.　　As an assistant ministry in administrative level， CWRC is a river valley organization dispatched by the Ministry of Water Resources （MWR）， PRC. It is authorized by the State to exercise part of the administrative functions of water management within the changjiang Valley（or Yangtze river Valley） and other rivers in south-west China， namely the unified management of the water resources of the valley and the rivers thereof in accordance with the“Water Law of the Peoples Republic of China”. CWRC is responsible for comprehensive regulation of the valley and development and management of those significant and controlling water projects， doing its best in terms of their planning， management， coordination and monitoring with all the necessary services provided so as to promote rivers harnessing and comprehensive exploitation and protection of the water resources available therein.　　Since its establishment 51 years ago， CWRC has done a lot of work in geological survey， hydrological investigation， water resources protection， soil and water conservation， planning and designing as well as scientific research for the valley， with a wealth of basic data， topographical， geological， hydrological，sediment-oriented， socioeconomic and else， collected and compiled in an all－round way. CWRC－issued and revised， a report， entitled the“Essentials on the changjiang Valley Comprehensive Utilization Planning”，was eventually approved by the State Council， and then it became an official legislative document for subsequent implementation of the river valley regulation and development program. Besides， planning efforts were also made for quite a number of transprovincial and important tributaries in addition to the regulation planning for the main river proper.　　In the past 50 plus years， acting in accordance with the instructions of the central authorities

关键词：水利部长江水利委员会 Water Resources scientific research Comprehensive Utilization the changjiang Valley resettlement planning Three Gorges Project the Gezhouba Project the changjiang river Ganjiang river Wujiang river investigation and design construction supervision comprehensive regulation technological progress hydropower development construction equipment Yangtze river Valley

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