Soil and water are vital resources in ecosystem, which should be managed properly for the existence of life on the earth. Day to day increase in population and their needs leads to a large alteration of lands from forest areas to agricultural and urban lands. In many cases these enormous alteration to the land forms destroys the balanced ecosystem and results in soil erosion. It is defined as the loosening of the soil from its place and its transportation from one place to another (R Kumar, 2005). Soil erosion is a three phase process consists of detachment of individual soil particle from land surface, transporting it from one place to another and its deposition. Final product of this process is sediment, which is any fragmented material transported or deposited by natural agent as water, wind, ice etc. Soil erosion is a severe environmental degradation problem which is affecting many countries adversely. As per the records of WWF (World Wildlife Fund) half of the topsoil on the planet has been lost in the last 150 years. Generally erosion issues are high in Asian, African and

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APPLICATION OF SWAT MODEL TO
ASSESS SUB-WATERSHED IN NGHIA
TRUNG, BINH PHUOC, VIET NAM
Nguyen Kim Loi1, Tran Thong Nhat1, Tran Le Nhu Quynh1,
Dang Thanh Ha1, Manuel Reyes2, Raghavan Srinivasan3
1Nong Lam University, HCMC, Vietnam
2North Carolina A&T State University (NCA&TSU), Greensboro, NC 27411, USA
3Texas A&M University, College Station, TX 77845, USA
Presented on SWAT-SEA Conference on Jan 7-8, 2009 in ChiangMai, Thailand

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6/10/2023 Mr. Tran Thong Nhat 2
Content
• Introduction
• Study area
• Data
• Methodology
• Results
• Suggestions
• References

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6/10/2023 Mr. Tran Thong Nhat 3
Introduction
• A part of the SANREM CRSP “Agroforestry and
Sustainable Vegetable Production in Southeast
Asia Watersheds” project
• Coordination: North Carolina A&T State
University
• Research team: Nong Lam University

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6/10/2023 Mr. Tran Thong Nhat 4
Justification
• The rapid increase of population
• The needs for economic growth
Land use changes within the watershed
• Pursuing integrated optimal planning
The sustainable uses of these watershed
resources
The optimal balance between economic
development and environmental quality within a
watershed

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6/10/2023 Mr. Tran Thong Nhat 5
Objectives
• The research attempts to solve sediment yield
through the SWAT
• To provide decision makers with a scientific tool
for supporting them in making decisions on
reservation of water and soil resources
• To assess the impact of land use practices to
sediment yield
• To make policy recommendations to policy
maker on land use change impact to sediment
yield

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6/10/2023 Mr. Tran Thong Nhat 6
Study Area

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6/10/2023 Mr. Tran Thong Nhat 7
Methodology
Scenario 1
LU: Existing Land use
Scenario 2
LU: Agroforestry
System
Comparation
Suggestions to
DM
SWAT

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6/10/2023 Mr. Tran Thong Nhat 8
SWAT
Soil parameters
Landuse parameters
Climate data
Results SWAT
Overlay for HRU
definition
ArcSWAT
Interface
Sub-watershed
delineation
DEM Drainage
Network
Soil Map
RS Image
Image
Classification
GIS Data
Landuse
Map
SWAT Model in Nghia Trung Sub – Watershed, Vietnam

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6/10/2023 Mr. Tran Thong Nhat 9
Data – Topo

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6/10/2023 Mr. Tran Thong Nhat 10
Watershed

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6/10/2023 Mr. Tran Thong Nhat 11
Overlay – HRU

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6/10/2023 Mr. Tran Thong Nhat 12
Climate data
ID NAME XPR YPR
1 DongPhu 725358.610 1280230.098
2 BuDang 737405.902 1286440.042
3 PhuocLong 721881.041 1295630.759

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6/10/2023 Mr. Tran Thong Nhat 13
Soil parameters

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6/10/2023 Mr. Tran Thong Nhat 14
LU Types
VALUE LANDSUE
19 ARGL
41 URBN
52 URLD
55 WATR
VALUE LANDSUE
20 FRST
41 URBN
52 URLD
55 WATR
Scenario 1: Existing Landuse Scenario 2: Agroforestry System

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6/10/2023 Mr. Tran Thong Nhat 15
Set up SWAT

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6/10/2023 Mr. Tran Thong Nhat 16
Results
Scenarios Sed Yield
(Ton/ha)
Surf Q
(mm)
1: ARGL 295.31 985.11
2: FRST 27.80 705.38
 Scenario 2 better than Scenario 1

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6/10/2023 Mr. Tran Thong Nhat 17
Suggestions
• Should measure observed data for calibration
• Need collecting more data for more perfect
research
– Water qualitiy
– Soil quality

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6/10/2023 Mr. Tran Thong Nhat 18
References
• 1. Stan Aronoff, 2005, Remote Sensing for GIS
Managers, ESRI Press
• 2. Canadian Centre for Remote Sensing, 2007,
Fundmentals of Remote Sensing,
http://www.ccrs.nrcan.gc.ca/resource/tutor/fundam/index
_e.php, July 04 2007
• 3. Zhilin Li, et. al, 2005, Digital Terrain Modeling,
Principles and Methodology, CRC Press
• 4. S.L. Neitsch, et. al, 2004, Soil and Water Assessment
Tool, Input/Output File Documentation
• 5. M. Winchell, et. al, 2007, ArcSWAT Interface for
SWAT2005, User’s Guide

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6/10/2023 Mr. Tran Thong Nhat 19
• THANK YOU FOR ATTENTION