2007年9月17-21日，国际地圈与生物圈计划（IGBP）的两个核心计划IMBER（ Integrated Marine Biogeochemistry and Ecosystem Research ）与LOICZ （Land-Ocean Interactions in Coastal Zone）在上海召开了就“陆架边缘”的联合开放科...2007年9月17-21日，国际地圈与生物圈计划（IGBP）的两个核心计划IMBER（ Integrated Marine Biogeochemistry and Ecosystem Research ）与LOICZ （Land-Ocean Interactions in Coastal Zone）在上海召开了就“陆架边缘”的联合开放科学大会。此次会议由IMBER与LOICZ就“陆架边缘”的联合工作组发起，国际上获得海洋科学指导委员会（SCOR）与IGBP的支持，展开更多
Introduction:We investigated the magnitude and duration of desalination of Pulicat—a coastal lagoon ecosystem connected to the Bay of Bengal on the South-eastern coast of India—during the 2015 South India flood even...Introduction:We investigated the magnitude and duration of desalination of Pulicat—a coastal lagoon ecosystem connected to the Bay of Bengal on the South-eastern coast of India—during the 2015 South India flood event which was a period of high-magnitude precipitation and riverine flooding.Methods:We estimated freshwater runoff into the lagoon using flow accumulation models for a period of 55 days(November 1 to December 25,2015)using daily gridded precipitation data from the Global Precipitation Measurement and a digital elevation model.Using the estimates of freshwater runoff,direct precipitation and observed salinities,we simulated water and salinity fluxes of the lagoon using the Land-Ocean Interactions in the Coastal Zone model.Further,we also used Monte Carlo simulation to estimate the uncertainty in system salinity,the residual salinity at the boundary and the freshwater residence times in the lagoon.Results:We estimated that a high volume(~760×10^(6) m^(3))of relatively low salinity waters(residual salinity=23.47 psu)had been exported from the lagoon to the Bay of Bengal during the period which is likely to have caused a strong dip in the daily salinity profile of the coastal sea.We contend that the lagoon experienced~40%desalination due to the 2015 event with a freshwater residence time of 18.5 days.Conclusions:The study highlighted the short-term,high-magnitude desalination undergone by Pulicat lagoon during the 2015 South India floods.Considering the high residual and exchange volumes obtained from the study,we conclude that Pulicat could be a major exporter of relatively low salinity waters to the Bay of Bengal during monsoons.展开更多
The distinctive characteristics of the modern Pearl River delta formation and development are divided phases, diversity and imbalance in spatial and temporal. The delta was moving seaward gradually in a long period af...The distinctive characteristics of the modern Pearl River delta formation and development are divided phases, diversity and imbalance in spatial and temporal. The delta was moving seaward gradually in a long period after the last Holocene glacial stage and the ancient drowned Pearl River estuary was predominated by tide. The delta was expanding quickly since fluvial force was turned to be leading status about 2500 years ago. The sediment grain size was changing longitudinally from coarser to finer. As well as the finer sediment may be reworked and redistributed shoreward by tidal current nearby the river mouth. And the fluvial-dominated delta is developed by the mutual deposition reflected in the vertical direction. According to the spatial difference of land-ocean interaction, the main body of the Pearl River delta which is the fluvial-dominated and protruding seaward is coupled with or concomitant with the estuaries and tide-dominated deltas which are adjoined to both sides of the main part like two展开更多
文摘2007年9月17-21日，国际地圈与生物圈计划（IGBP）的两个核心计划IMBER（ Integrated Marine Biogeochemistry and Ecosystem Research ）与LOICZ （Land-Ocean Interactions in Coastal Zone）在上海召开了就“陆架边缘”的联合开放科学大会。此次会议由IMBER与LOICZ就“陆架边缘”的联合工作组发起，国际上获得海洋科学指导委员会（SCOR）与IGBP的支持，
文摘Introduction:We investigated the magnitude and duration of desalination of Pulicat—a coastal lagoon ecosystem connected to the Bay of Bengal on the South-eastern coast of India—during the 2015 South India flood event which was a period of high-magnitude precipitation and riverine flooding.Methods:We estimated freshwater runoff into the lagoon using flow accumulation models for a period of 55 days(November 1 to December 25,2015)using daily gridded precipitation data from the Global Precipitation Measurement and a digital elevation model.Using the estimates of freshwater runoff,direct precipitation and observed salinities,we simulated water and salinity fluxes of the lagoon using the Land-Ocean Interactions in the Coastal Zone model.Further,we also used Monte Carlo simulation to estimate the uncertainty in system salinity,the residual salinity at the boundary and the freshwater residence times in the lagoon.Results:We estimated that a high volume(~760×10^(6) m^(3))of relatively low salinity waters(residual salinity=23.47 psu)had been exported from the lagoon to the Bay of Bengal during the period which is likely to have caused a strong dip in the daily salinity profile of the coastal sea.We contend that the lagoon experienced~40%desalination due to the 2015 event with a freshwater residence time of 18.5 days.Conclusions:The study highlighted the short-term,high-magnitude desalination undergone by Pulicat lagoon during the 2015 South India floods.Considering the high residual and exchange volumes obtained from the study,we conclude that Pulicat could be a major exporter of relatively low salinity waters to the Bay of Bengal during monsoons.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 49776304).
文摘The distinctive characteristics of the modern Pearl River delta formation and development are divided phases, diversity and imbalance in spatial and temporal. The delta was moving seaward gradually in a long period after the last Holocene glacial stage and the ancient drowned Pearl River estuary was predominated by tide. The delta was expanding quickly since fluvial force was turned to be leading status about 2500 years ago. The sediment grain size was changing longitudinally from coarser to finer. As well as the finer sediment may be reworked and redistributed shoreward by tidal current nearby the river mouth. And the fluvial-dominated delta is developed by the mutual deposition reflected in the vertical direction. According to the spatial difference of land-ocean interaction, the main body of the Pearl River delta which is the fluvial-dominated and protruding seaward is coupled with or concomitant with the estuaries and tide-dominated deltas which are adjoined to both sides of the main part like two
