Doctoral Dissertation summary: Geomorphology of coastal estuaries in Northern central Vietnam

Practical significance: the scientific outcomes can be used to improve the territorial management capacity of local authorization offices on the rational use of territorial resources and environmental protection of coastal estuaries in northern central Vietnam.
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Doctoral Dissertation summary: Geomorphology of coastal estuaries in Northern central Vietnam VIETNAM ACADEMY OFMINISTRY OF EDUCATION SCIENCE AND AND TRAINING TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ----------------------------- NGUYỄN CÔNG QUÂNGEOMORPHOLOGY OF COASTAL ESTUARIES IN NORTHERN CENTRAL VIETNAM Major: Geomorphology and Paleogeomorphology Codename: 09 44 02 18 DOCTORAL DISSERTATION SUMMARY Hanoi 2019 The doctoral dissertation was accomplished at the Graduate University of Science and Technology – Vietnam Academy of Science and Technology.Principal supervisorDr. PHẠM VĂN HÙNG – Institute of Geological Science, VASTSecondary/Other supervisorDr. PHẠM QUANG SƠN – Institute of Geological Science, VASTReviewer 1:Reviewer 2:Reviewer 3:The final doctoral dissertation defense will be defended in front ofUniversity Dissertation Committee at… (hrs), … 2019 in theGraduate University of Science and Technology, Vietnam Academyof Science and Technology.The dissertation can be accessed in - Graduate University of Science and Technology, VAST library. - National Library of Vietnam. INTRODUCTION1. Background Coastal estuaries locate on where the rivers meet the sea, withmany favorable physical conditions for human to settle and develop.Large urbans with concentrated residental areas, economic zones,national defense and security regions are gradually expanded onthose areas to serve the people such as industrial sites, administrativearea, civil works, airports, harbors, services, trades, etc. The topology of the coastal estuaries on Vietnam NorthernCentral coast has formed and developed under the interplay ofnumerous external, internal and artificial dynamical processes;furthermore, these are also stage for complex river-oceaninteractions. The consequence of those processes has made coastalestuaries prograde toward the sea since Pleistocene epoch to themodern day, formed identical type of landform from shoals,sandbars, sand barriers to deltas. Coastal estuaries are normallyfavourable places for socio-economic developments, but they arealso intimidated as sea level risings which can cause coastal erosion,flooding… and damage coastal construction and lives of localresidents. In the context of global climate changes and sea level rise, andunder the pressure of the economy, growing socio-economicdevelopment, the topology of coastal estuaries on the NorthernCentral Vietnam has been drastically transformed at many time andspatial scales. This dissertation titled “Geomorphology of coastalestuaries in northern central Vietnam” is the final result of studies tofulfill the necessarirarity of many urgent objectives towardsustainable socio-economic development and environmentprotection.2. Objectives- Interpret the geomorphological features of coastal estuaries in 1northern central Vietnam.- Estimate the course of morphological changes andgeomorphological dynamic processes in the study area.3. Research subjects and Study- Research subjects: Morphology and modern geomorphologicaldynamic processes of coastal estuaries in northern central Vietnam.- Study area: the main study areas are the coastal estuaries of Ma,Thach Han and Huong rivers (from bifurcation channel to subtidalflats). The interested morphological changes of the study areas arefocused during those following phases: late Upper Pleistocene –middle Lower Holocene, middle Lower Holocene – Upper Holocene,and Upper Holocene – present. Figure 1: Map of study area 24. Data and methodology Data and methodology of the doctoral dissertation includingdocuments, database was collected and analysed by the author duringthe course.5. Research ObjectivesResearch objective 1: The morphology of coastal estuaries innorthern central Vietnam is heterogenous, complicated and spatiallydiverged to latitudinal pattern. Landform of the interested coastalestuaries were classified following morphodynamic genesisapproach: the Ma estuary is classified as “delta”, including thealluvial, mixed and marine dynamical processes with the number ofmorphological unit of 3, 7, and 3 accordingly. The two others areclassified as “Liman” type, with respective landform units of alluvial– mixed – marine dynamical processes are 4, 7, 6 units for ThachHan estuary, and 4, 9, 4 units for Huong estuary.Research objective 2: During late Quaternary to present, themorphology of interested coastal estuaries had undergone 3 phases:late Upper Pleistocene – middle Lower Holocene, middle LowerHolocene – Upper Holocene, ...