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Student Number 970202604
Author Nguyen Van(¨¿¤å¾å)
Author's Email Address No Public.
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Department Master of Science Program in Remote Sensing Science and Technology
Year 2009
Semester 2
Degree Master
Type of Document Master's Thesis
Language English
Title Using Landsat MSS/TM & ETM images to detect the changes of the Mekong riverbank in Vietnam
Date of Defense 2010-06-18
Page Count 88
Keyword
  • images detection
  • Landsat MSS/TM & ETM
  • Mekong riverbank
  • Abstract The Mekong River is the world¡¦s twelfth largest river. It starts from China and flows through
    Myanmar, Lao PDR, Thailand, Cambodia and ends in the South China Sea in Vietnam.
    Coming to Vietnam, the river is naturally divided into two main streams; Hau River and Tien
    River, and a series of canals are also originated from these two rivers, this creates here a
    large delta with name ¡§the Mekong Delta¡¨ or ¡§the Cuu Long Delta¡¨ in Vietnamese language.
    The Mekong Delta in Vietnam is one of the largest deltas in Asia with area of around
    49,520km2, and covers thirteen provinces. It has advantageous position, plentiful natural
    resource, and keeps important role for developing economy both region and nation,
    especially crop product and aquiculture.
    However, in recent years, people here have to resist natural disasters as flood, drought, and
    landslide, these make environment and life of the region changed seriously. One of the
    causes of the disasters is riverbanks change of Tien and Hau river as land erosion and
    accretion that are influenced by both natural process and man-made activities.
    This study used Landsat satellite images of years 1972, 1989, and of years from 2000 to
    2005, and Remote sensing & GIS techniques to detect changes of riverbanks of Tien and
    Hau river in periods; 1972 ¡V 1989, 1989-2000, 2000- 2005, and 1972 - 2005. In addition, the
    study found main reasons and effects of land erosion and accretion in these rivers, and also
    carried out remedies for riverbanks protection works.
    Table of Content Chinese abstract i
    English abstract ii
    Acknowledgements iii
    Table of Contents iv
    List of Figures vii
    List of Tables ix
    Explanation of Symbols x
    Chapter 1: Introduction. 1
    1.1. General introduction to the Mekong River. 1
    1.2. General introduction to the study area 4
    1.2.1. Geography 4
    1.2.2. Topography 5
    1.2.3. Geology 8
    1.3. Research objectives 9
    Chapter II: Background of Mekong Delta in Vietnam 11
    2.1 Environmental conditions of Mekong Delta 11
    2.1.1 Meteorology 11
    2.1.2. River systems 12
    2.1.3 Oceanography 14
    2.1.4. Water resources 15
    2.1.5. Soil 15
    2.1.6. Saline water intrusion 16
    2.1.7. Floods 17
    2.2. Economic & Social conditions of Mekong Delta 18
    2.2.1. Population and people 18
    2.2.2. Economy 20
    2.2.3. Transport infrastructure 21
    Chapter III: Techniques, Data, and Methodology 23
    3.1. Remote Sensing Technology and Geographic Information System (GIS) 23
    3.1.1. Remote sensing overview 23
    3.1.2. GIS overview 25
    3.1.3. Application of Remote sensing and GIS 26
    3.1.4. Landsat image sensors 26
    3.1.5. Maps overview 28
    3.2. Research data 29
    3.2.1. Landsat Satellite images 29
    3.2.2. Administrative and Topographical maps 29
    3.3. Methodology 30
    3.3.1. Geometric correction 31
    3.3.2. Image thresholding. 33
    3.3.3. Spectral band ratio 34
    3.3.4. Multiplying image 36
    3.3.5. Filtering image 37
    3.3.6. Raster to vector conversion 38
    Chapter IV: Result and Discussion 40
    4.1. The riverbank mapping process 40
    4.1.1. Geometric correction 40
    4.1.2. Finding the threshold values of Landsat MSS/TM&ETM+ images 41
    4.1.3. Band spectral ratio image 42
    4.1.4. Multiplying images 43
    4.1.5. Filtering images 43
    4.1.6. Converting raster to vector data 44
    4.2. Comparing the changes of riverbanks and islands 45
    4.2.1. The changes of riverbanks in period of 1972 ¡V 1989 45
    4.2.2. The changes of riverbanks in period of 1989 ¡V 2000 49
    4.2.3. The changes of riverbanks in period of 2000 ¡V 2005 52
    4.2.4. The annual mean changes of riverbanks in period of 1972 - 2005 54
    4.3. Causes of land erosion/accretion in Tien and Hau river. 56
    4.3.1. Annual floods 56
    4.3.2. Deforestation 57
    4.3.3. Exploiting sand from river bed 58
    4.3.4. Dredging the canals and waterway transports 59
    4.3.5. Encroaching river bed 60
    4.4. Effects from land erosion and accretion in Tien and Hau river 60
    4.4.1. Deterioration of living environment 60
    4.4.2. People and cost damages 61
    4.5. Remedies to reduce land erosion/accretion phenomenon 62
    4.5.1. Technical remedies 62
    4.5.2. Non technical remedies 63
    Chapter V: Conclusion and Recommendation 64
    5.1. Conclusion 64
    5.2. Recommendation 64
    References 66
    Appendices 69
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    Advisor
  • Pai-Chang Chung(±i¤¤¥Õ)
  • Files
  • 970202604.pdf
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    Date of Submission 2010-07-27

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