The distribution of winter suspended particulate matters(SPM)in the South Yellow Sea was studied in this paper based on the LISST data acquired in January 2007.Mass concentration of SPM was measured by membrane filtering,drying and weighting in the laboratory.Water temperature and salinity surveyed by CTD were also taken into account in this study.Volume concentration was converted to mass concentration,considering the closely correlation between the volume concentrations of SPM observed by LISST and the mass concentration collected by suction filtration.Furthermore,volume concentrations were preferred to the description of SPM distribution in the South Yellow Sea,because of its high resolution in the vertical direction.Fine particles can be suspended by coastal currents,while coarse biological particles can be transported by the Yellow Sea Warm Current.SPM can be concentrated below the thermocline.This study has provided a perspective to the detailed description of vertical distribution of SPM.
{"title":"Distribution of Winter Suspended Particulate Matters in the South Yellow Sea Based on Lisst Data","authors":"Jianchao Li, Lulu Qiao, Guangxue Li, Yong Liu, Yanyan Ma, Ling Liu","doi":"10.3724/SP.J.1140.2013.05013","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.05013","url":null,"abstract":"The distribution of winter suspended particulate matters(SPM)in the South Yellow Sea was studied in this paper based on the LISST data acquired in January 2007.Mass concentration of SPM was measured by membrane filtering,drying and weighting in the laboratory.Water temperature and salinity surveyed by CTD were also taken into account in this study.Volume concentration was converted to mass concentration,considering the closely correlation between the volume concentrations of SPM observed by LISST and the mass concentration collected by suction filtration.Furthermore,volume concentrations were preferred to the description of SPM distribution in the South Yellow Sea,because of its high resolution in the vertical direction.Fine particles can be suspended by coastal currents,while coarse biological particles can be transported by the Yellow Sea Warm Current.SPM can be concentrated below the thermocline.This study has provided a perspective to the detailed description of vertical distribution of SPM.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"13"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.040183
Guanhua Li, D. Xia, Jiabo Liu, Y. Wen, Shuang Zhao, J. Jia
In this paper,we studied the characteristics of major geochemical elements and weathering intensity of the loess deposits at the Tacheng section,Xinjiang,northwest China.Results show that among the oxides of the major geochemical elements,SiO2,Al2O3,CaO,CO3,Fe2O3,MgO,K2O and Na2O occur in a decreasing order in the loess section.There is obvious differentiation of oxides in the palaeosol and loess layers and the average contents of Al2O3,Fe2O3 and CaO were markedly higher in paleosol layers.CaO,Fe2O3,MgO,and K2O were accumulated and Na2O,SiO2,Al2O3 depleted in the section compared to the upper continental crust(UCC).The oxides have different distribution pattern in loess and paleosols and some of the major geochemical elements exhibit different concentrations in the topsoils and the paleosols.Further analysis shows that the Tacheng section had experienced weak chemical weathering after deposition,which was similar to the Yili loess section but far weaker than the loess deposits in the Chinese Loess Plateau and the lower reaches of the Yangtze River.The differentiation of weathering degree between the loess and paleosol was also distinct,indicating that the paloesols have experienced stronger weathering process.However,the eluviation of paleosol layers was weaker than that of loess layers probably resulting from the decline of humidity during the period of pedogenesis.The heat-moisture pattern might exert important effect on the chemical weathering of loess/paleosol sequences in the arid area.
{"title":"CHARACTERISTICS OF MAJOR GEOCHEMICAL ELEMENTS OF TACHENG LOESS DEPOSITS IN XINJIANG AND ITS PALEOENVIRONMENTAL IMPLICATIONS","authors":"Guanhua Li, D. Xia, Jiabo Liu, Y. Wen, Shuang Zhao, J. Jia","doi":"10.3724/SP.J.1140.2013.040183","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.040183","url":null,"abstract":"In this paper,we studied the characteristics of major geochemical elements and weathering intensity of the loess deposits at the Tacheng section,Xinjiang,northwest China.Results show that among the oxides of the major geochemical elements,SiO2,Al2O3,CaO,CO3,Fe2O3,MgO,K2O and Na2O occur in a decreasing order in the loess section.There is obvious differentiation of oxides in the palaeosol and loess layers and the average contents of Al2O3,Fe2O3 and CaO were markedly higher in paleosol layers.CaO,Fe2O3,MgO,and K2O were accumulated and Na2O,SiO2,Al2O3 depleted in the section compared to the upper continental crust(UCC).The oxides have different distribution pattern in loess and paleosols and some of the major geochemical elements exhibit different concentrations in the topsoils and the paleosols.Further analysis shows that the Tacheng section had experienced weak chemical weathering after deposition,which was similar to the Yili loess section but far weaker than the loess deposits in the Chinese Loess Plateau and the lower reaches of the Yangtze River.The differentiation of weathering degree between the loess and paleosol was also distinct,indicating that the paloesols have experienced stronger weathering process.However,the eluviation of paleosol layers was weaker than that of loess layers probably resulting from the decline of humidity during the period of pedogenesis.The heat-moisture pattern might exert important effect on the chemical weathering of loess/paleosol sequences in the arid area.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"183"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.040193
E. ChongYi, Guangchao Cao, G. Hou, Yongjuan Sun, Yingying Jiang, Fan Li
The Qinghai Lake area is a hot spot in global change studies,due to its sensitivity to global warming.During the last deglaciation,aeolian deposits were widely distributed in the region,with drastic environmental and climatic changes.In this paper,we studied two loess sections(JXG1and JXG2) near the Jiangxigou town to the south of Qinghai Lake,upon which we reconstructed the regional environmental changes since the last deglaciation.The results show that :(1) During 13～11.5kaBP,the paleolclimate was cold and dry there.Aeolian deposition prevailed and sandy loess formed.In general,the region was changing from a cold and dry to a cool and humid environment;(2) During 11.5～5kaBP,pedogenesis was relatively strong.Maximum moisture levels occurred during the period of 9～5kaBP,and in general,the paleoclimate was warm and wet;(3) After 5kaBP,climate often alternated,dust storm occurred frequently,vegetation coverage decreased,and the climate entered a relatively unstable stage.The environmental changes of the Jiangxigou Loess section are comparable with those revealed by the boreholes in the Qinghai Lake and the Heimahe loess section.The redness of the Jiangxigou loess section is a sensitive index to environmental change.The loess deposition since the last deglaciation in Qinghai Lake area was mainly controlled by the ice volume of the northern hemisphere,which was driven by the summer solar irradiation at the high latitude.The Westerlies played the role as a cold-air conveyer between the North Atlantic and the northeastern Tibetan Plateau.
{"title":"THE ENVIRONMENTAL CHANGE RECORDED IN JIANGXIGOU LOESS SECTIONS IN QINGHAI LAKE REGION","authors":"E. ChongYi, Guangchao Cao, G. Hou, Yongjuan Sun, Yingying Jiang, Fan Li","doi":"10.3724/SP.J.1140.2013.040193","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.040193","url":null,"abstract":"The Qinghai Lake area is a hot spot in global change studies,due to its sensitivity to global warming.During the last deglaciation,aeolian deposits were widely distributed in the region,with drastic environmental and climatic changes.In this paper,we studied two loess sections(JXG1and JXG2) near the Jiangxigou town to the south of Qinghai Lake,upon which we reconstructed the regional environmental changes since the last deglaciation.The results show that :(1) During 13～11.5kaBP,the paleolclimate was cold and dry there.Aeolian deposition prevailed and sandy loess formed.In general,the region was changing from a cold and dry to a cool and humid environment;(2) During 11.5～5kaBP,pedogenesis was relatively strong.Maximum moisture levels occurred during the period of 9～5kaBP,and in general,the paleoclimate was warm and wet;(3) After 5kaBP,climate often alternated,dust storm occurred frequently,vegetation coverage decreased,and the climate entered a relatively unstable stage.The environmental changes of the Jiangxigou Loess section are comparable with those revealed by the boreholes in the Qinghai Lake and the Heimahe loess section.The redness of the Jiangxigou loess section is a sensitive index to environmental change.The loess deposition since the last deglaciation in Qinghai Lake area was mainly controlled by the ice volume of the northern hemisphere,which was driven by the summer solar irradiation at the high latitude.The Westerlies played the role as a cold-air conveyer between the North Atlantic and the northeastern Tibetan Plateau.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"193"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.05147
X. Teng, Zhigao Zhang, Wenbin Peng, J. Zan, X. Fang
The large area of eolian loess distributed over the northern slope of the middle Tianshan between the altitude of 2 400~2 700m has provided a good opportunity to study the loss rock magnetic properties of Central Asia and the evolutionary process of the extreme arid areas of NW China.Our research profile is located on the sixth terrace of Qingshui river on the northern slope of Tianshan.We collected 580 of bulk samples for analysis of the rock magnetic susceptibility at a 10~20cm interval and selected several samples for analyses of other magnetic parameters.Results show that the magnetic properties of the Tianshan Loess are mainly controlled by low-coercivity ferrimagnetic minerals(such as magnetite and maghemite),significantly different from the loess sequence of the Loess Plateau,and the contribution of ultrafine pedogenically-produced magnetic grains to loess magnetic susceptibility is very limited,while the increased coarse ferrimagnetic minerals from the source region play a decisive role in increasing magnetic susceptibility in the Tianshan region.The gradual increasing trend in magnetic susceptibility and the coarsening upwards trend of grain size since 0.8Ma may be the response to the aridification process in the inland Asia since the mid-Pleistocene.
{"title":"Rock-Magnetic Characteristics of the Tianshan Loess and the Mechanism for Enhancing Magnetic Susceptibility","authors":"X. Teng, Zhigao Zhang, Wenbin Peng, J. Zan, X. Fang","doi":"10.3724/SP.J.1140.2013.05147","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.05147","url":null,"abstract":"The large area of eolian loess distributed over the northern slope of the middle Tianshan between the altitude of 2 400~2 700m has provided a good opportunity to study the loss rock magnetic properties of Central Asia and the evolutionary process of the extreme arid areas of NW China.Our research profile is located on the sixth terrace of Qingshui river on the northern slope of Tianshan.We collected 580 of bulk samples for analysis of the rock magnetic susceptibility at a 10~20cm interval and selected several samples for analyses of other magnetic parameters.Results show that the magnetic properties of the Tianshan Loess are mainly controlled by low-coercivity ferrimagnetic minerals(such as magnetite and maghemite),significantly different from the loess sequence of the Loess Plateau,and the contribution of ultrafine pedogenically-produced magnetic grains to loess magnetic susceptibility is very limited,while the increased coarse ferrimagnetic minerals from the source region play a decisive role in increasing magnetic susceptibility in the Tianshan region.The gradual increasing trend in magnetic susceptibility and the coarsening upwards trend of grain size since 0.8Ma may be the response to the aridification process in the inland Asia since the mid-Pleistocene.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"147"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.030123
Jingong Cai, Mingshui Song, Longfei Lu, Y. Bao, F. Ding, Jinli Xu
Traditionally,it is believed that kerogen,a organic matter insoluble in organic solvents separated chemically from source rock,is a material for hydrocarbon generation[1].The procedure to treat samples as such,however,may destroy the original occurrence and relationship between organic matter and clay in source rocks.We extracted an organo-clay complex(2μm) from the crushed source rocks in the depth of 280~3 500 m,in the Jiyang sag,East China.The complex is mainly composed of layered illite-smectite(I-S) and illite with a value of TOC up to 2.62%~9.78%.After treatment with H2 O2,TOC remains as high as 1.23%~4.63%,suggesting that it is the components in which organic matters are enriched.The diffraction peak(d001) of the complex is 1.3~1.4nm at 250℃,and moves to 1.0 nm at 550 ℃ in XRD curves,and the exothermic peaks of the complex is extraordinary stable at 350 ℃ in DTA curves.;The result is consistent in both the XRD and DTA observations.It indicates that organic matter can enter the interlayer space of clay minerals.With PY-GC analysis,the organic matter of C5 and C25 is released from the complex in a temperature range of 250~650 ℃,and reaches a peak at about 450 ℃.Our findings reveal that organic matter can enter interlayer of clay minerals forming a kind of natural and highly stable organo-clay complex,and the composition of the organic matter in the complex is similar to the crude oil.As a kind of natural material,the organo-clay complex plays an important role in hydrocarbon generation in source rocks.
{"title":"ORGANO-CLAY COMPLEXES IN SOURCE ROCKS——A NATURAL MATERIAL FOR HYDROCARBON GENERATION","authors":"Jingong Cai, Mingshui Song, Longfei Lu, Y. Bao, F. Ding, Jinli Xu","doi":"10.3724/SP.J.1140.2013.030123","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.030123","url":null,"abstract":"Traditionally,it is believed that kerogen,a organic matter insoluble in organic solvents separated chemically from source rock,is a material for hydrocarbon generation[1].The procedure to treat samples as such,however,may destroy the original occurrence and relationship between organic matter and clay in source rocks.We extracted an organo-clay complex(2μm) from the crushed source rocks in the depth of 280~3 500 m,in the Jiyang sag,East China.The complex is mainly composed of layered illite-smectite(I-S) and illite with a value of TOC up to 2.62%~9.78%.After treatment with H2 O2,TOC remains as high as 1.23%~4.63%,suggesting that it is the components in which organic matters are enriched.The diffraction peak(d001) of the complex is 1.3~1.4nm at 250℃,and moves to 1.0 nm at 550 ℃ in XRD curves,and the exothermic peaks of the complex is extraordinary stable at 350 ℃ in DTA curves.;The result is consistent in both the XRD and DTA observations.It indicates that organic matter can enter the interlayer space of clay minerals.With PY-GC analysis,the organic matter of C5 and C25 is released from the complex in a temperature range of 250~650 ℃,and reaches a peak at about 450 ℃.Our findings reveal that organic matter can enter interlayer of clay minerals forming a kind of natural and highly stable organo-clay complex,and the composition of the organic matter in the complex is similar to the crude oil.As a kind of natural material,the organo-clay complex plays an important role in hydrocarbon generation in source rocks.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"123"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69773251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.04055
Dongju Zhang, Fahu Chen
Paleolithic environmental archaeology,which aims at the study of the interaction between mankind and the environment,in North China has significantly developed in the past two to three decades,owing to the enormous accumulation of archaeological materials,big advances in scientific technology and rapid improvement of study methods.The aim of environmental archaeology is to understand how the mankind adapted to the environment,or how the mankind used natural resources to responde to environment changes.This paper reviewed the studies about the human history of the utilization of geological resources,raw material resources,plant and animal resources,and discussed the response of human being to environment changes through migratian and technology development.The further development of paleolithic environmental archaeology requius close collaboration between archaeologists,geologists and geographers.
{"title":"A REVIEW OF PALEOLITHIC ENVIRONMENTAL ARCHAEOLOGY IN NORTH CHINA","authors":"Dongju Zhang, Fahu Chen","doi":"10.3724/SP.J.1140.2013.04055","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.04055","url":null,"abstract":"Paleolithic environmental archaeology,which aims at the study of the interaction between mankind and the environment,in North China has significantly developed in the past two to three decades,owing to the enormous accumulation of archaeological materials,big advances in scientific technology and rapid improvement of study methods.The aim of environmental archaeology is to understand how the mankind adapted to the environment,or how the mankind used natural resources to responde to environment changes.This paper reviewed the studies about the human history of the utilization of geological resources,raw material resources,plant and animal resources,and discussed the response of human being to environment changes through migratian and technology development.The further development of paleolithic environmental archaeology requius close collaboration between archaeologists,geologists and geographers.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"55"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Routine chemical analysis was performed for the gasfield water of Dongfang block and Ledong block in the Yinggehai Basin.Together with other analytical data,such as the water type,Na/Cl ratio(metamorphic coefficient),desulfurization coefficient,and Cl/Mg ratio,we studied the geochemical and hydrochemical characteristics of two blocks and their relation with the closure and preservation conditions of the gas reservoir.Based on the research work mentioned above,with the consideration of the geological conditions for accumulation of natural gas in the Yinggehai Basin,we paid more attention to the distribution pattern of gasfield water and its controlling factors in the two blocks,and the genetic relationship between the gasfield water and process of gas migration and accumulation.It is found that(1)the gasfield water of the two blocks is similar in origin and evolution.The preservation of natural gas is basically in good condition.However,the water chemical composition parameters indicate that the preservation conditions in the Ledong block are little worse than those in the Dongfang block.(2)The Dongfang gasfield is dominated by NaHCO3 type of gasfield water.The distribution pattern of the water has close relationship with the fault system.The Dongfang gasfield is low in opening degree and sealing property and the caprock of gas reservoir is good,as the gasfield water indicates.Therefore,it is favorable for the accumulation and preservation of hydrocarbons.The Ledong gasfield water is diverse with complex origin,the preservation condition is little worse than that in the Dongfang block.(3)Both the gasfield water and natural gas reservoirs of the two blocks have strong variations in spatial distribution.(4)The mud diapir and the accompanied thermal fluid in the Yinggehai Basin play an important role in controlling and affecting the origin and distribution pattern of the gasfield water as well as the gas migration and accumulation.
{"title":"Geochemistry and Petroleum Geological Significance of Gas Field Water in the Central Mud Diapiric Belt of Yinggehai Basin","authors":"Wei Zhang, Jiaxiong He, Xiaofeng Gong, Jingru Zhang","doi":"10.3724/SP.J.1140.2013.05119","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.05119","url":null,"abstract":"Routine chemical analysis was performed for the gasfield water of Dongfang block and Ledong block in the Yinggehai Basin.Together with other analytical data,such as the water type,Na/Cl ratio(metamorphic coefficient),desulfurization coefficient,and Cl/Mg ratio,we studied the geochemical and hydrochemical characteristics of two blocks and their relation with the closure and preservation conditions of the gas reservoir.Based on the research work mentioned above,with the consideration of the geological conditions for accumulation of natural gas in the Yinggehai Basin,we paid more attention to the distribution pattern of gasfield water and its controlling factors in the two blocks,and the genetic relationship between the gasfield water and process of gas migration and accumulation.It is found that(1)the gasfield water of the two blocks is similar in origin and evolution.The preservation of natural gas is basically in good condition.However,the water chemical composition parameters indicate that the preservation conditions in the Ledong block are little worse than those in the Dongfang block.(2)The Dongfang gasfield is dominated by NaHCO3 type of gasfield water.The distribution pattern of the water has close relationship with the fault system.The Dongfang gasfield is low in opening degree and sealing property and the caprock of gas reservoir is good,as the gasfield water indicates.Therefore,it is favorable for the accumulation and preservation of hydrocarbons.The Ledong gasfield water is diverse with complex origin,the preservation condition is little worse than that in the Dongfang block.(3)Both the gasfield water and natural gas reservoirs of the two blocks have strong variations in spatial distribution.(4)The mud diapir and the accompanied thermal fluid in the Yinggehai Basin play an important role in controlling and affecting the origin and distribution pattern of the gasfield water as well as the gas migration and accumulation.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"119"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3724/SP.J.1140.2013.05053
Wang Yan, Wang Houjie, Bi Naishuang, Zhang Yong
The water-sediment regulation provides a good opportunity for the observation of the hyperpycnal flows at the Huanghe(Yellow River)estuary.The concentration(SSC)and median grain size of the suspended sediment are important factors to the formation of hyperpycnal flows.During the 10th watersediment regulation on June 19th,2010,in order to study the variations in water and sediment discharge off the Huanghe River mouth and to predict the formation of hyperypycnal flow,synchronous survey were carried out at the Lijin station,which includes the sampling of the suspended sediment and measurement of the bathymetry and current system.The results suggest that when the reservoirs on the upper reaches of the river started to release water with low suspended sediment concentration(SSC)on schedule,the water discharge recorded at the Lijin station increased sharply,together with the intensification of riverbed erosion.A great amount of the coarser particles were resuspended from the riverbed,resulting in the increase in suspended sediment concentration(SSC)and sediment load(SL)of the water,as the major contributor to the rise of suspended concentration of coarser sediment.In the later stage,under the influence of hyperpycnal discharge off the Xiaolangdi Reservoir,the water discharge recorded at the Lijin station decreased quickly,while the SSC and SL remarkably increased off the Lijin station up to the river mouth.The remarkable increase in fine sediment concentration led to the heavy siltation on the riverbed.It was possible to predict the hyperpycnal process at the river mouth,since both high SSC and fine particles concentration are the necessary requirements for the formation of hyperpycnal flow.The hyperpycnal flow would not only deliver a large amount of sediments from the river to the coastal sea in a short period,but also bring impact to the geomorphological and biogeochemical evolutions of the estuary.
{"title":"RESPONSE OF WATER-SEDIMENT DISCHARGE OF HUANGHE (YELLOW RIVER)TO THE HYPERPYCNAL FLOW CAUSED BY WATER-SEDIMENT REGULATION IN 2010","authors":"Wang Yan, Wang Houjie, Bi Naishuang, Zhang Yong","doi":"10.3724/SP.J.1140.2013.05053","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2013.05053","url":null,"abstract":"The water-sediment regulation provides a good opportunity for the observation of the hyperpycnal flows at the Huanghe(Yellow River)estuary.The concentration(SSC)and median grain size of the suspended sediment are important factors to the formation of hyperpycnal flows.During the 10th watersediment regulation on June 19th,2010,in order to study the variations in water and sediment discharge off the Huanghe River mouth and to predict the formation of hyperypycnal flow,synchronous survey were carried out at the Lijin station,which includes the sampling of the suspended sediment and measurement of the bathymetry and current system.The results suggest that when the reservoirs on the upper reaches of the river started to release water with low suspended sediment concentration(SSC)on schedule,the water discharge recorded at the Lijin station increased sharply,together with the intensification of riverbed erosion.A great amount of the coarser particles were resuspended from the riverbed,resulting in the increase in suspended sediment concentration(SSC)and sediment load(SL)of the water,as the major contributor to the rise of suspended concentration of coarser sediment.In the later stage,under the influence of hyperpycnal discharge off the Xiaolangdi Reservoir,the water discharge recorded at the Lijin station decreased quickly,while the SSC and SL remarkably increased off the Lijin station up to the river mouth.The remarkable increase in fine sediment concentration led to the heavy siltation on the riverbed.It was possible to predict the hyperpycnal process at the river mouth,since both high SSC and fine particles concentration are the necessary requirements for the formation of hyperpycnal flow.The hyperpycnal flow would not only deliver a large amount of sediments from the river to the coastal sea in a short period,but also bring impact to the geomorphological and biogeochemical evolutions of the estuary.","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"33 1","pages":"53-61"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69774658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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