Enhancement of the SWAT-REMM System for Simulation of T-N Reduction Efficiency with Riparian Buffer System at Bonggok watershed
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Enhancement of the SWAT-REMM System for Simulation of T-N Reduction Efficiency with Riparian
Buffer System at Bonggok watershed
Enhancement of the SWAT-REMM System for Simulation of T-N Reduction Efficiency with Riparian Buffer System
at Bonggok watershed
2010 SWAT Conference Annual International Meeting
August 4-6, 2010
Jichul Ryu, J. P. Cho, I. J. Kim, Y. Mun, J.P. Moon, N. Kim, S.J. Kim, D.S. Kong, K.J. Lim Kangwon National Univ., South Korea
Introduction
BMPs, Riparian Buffer System, The purpose of this study
Introduction
Various Best Management Practices (BMPs) have been proposed to mitigate adverse impacts on water bodies and ecosystem of non-point source pollution.
The riparian buffer system (RBS) has been recommended among a lot of researchers studying in this field.
The SWAT-REMM prototype model was developed by the researchers in Canada.However, the SWAT-REMM prototype model has a lot of limitation.
The purposes of this study are to:I. Improve the prototype version of the SWAT-REMM system
II. Simulate water quality improvement with riparian buffer system using SWAT-REMM enhanced model
Methodologies
REMM, SWAT-REMM prototype, SWAT-REMM enhanced system
Wha
t is t
he R
EMM
mod
el ?
What is SW
AT-REMM
Prototype?Liu, Y., Yang, W., and Wang, X.(2007). GIS-based Integration of SWAT and REMM for
Estimating Water Quality Benefits of Riparian Buffer in Agricultural Watersheds. Transactions of the ASABE, 50(5), pp. 1549-1563.
Buffer Drainage
Concentrated Drainage
Limitations of SWAT-REMM Prototype
The SWAT-REMM prototype …• can NOT simulate riparian buffer system established at severalsubwatersheds
• can NOT reflect soil properties of riparian buffer zone at studywatershed
• can NOT consider multiple weather stations
• can NOT consider NO3-N load in baseflow through riparian buffersystem
•was NOT tightly coupled (run SWAT first, run REMM and then run SWAT routing manually)
Development of SWAT-REMM Enhanced system
Enhancement of SWAT-REMM system
SWAT Watershed Delineation Interface was modified to delineates buffer/concentrateddrainage for user-specifying reach segment
1. Can simulate riparian buffer system established at several subwatersheds.
Enhancement of SWAT-REMM system2. Reflects soil properties of riparian buffer zone at study watershed
Buffer Zone1
Buffer Zone2
Buffer Zone3
Subwatershed, Buffer zone
Soil LayerLayer 1
Layer 2
Layer 3
Sub. 1,Buffer 1
Sub. 2,Buffer 2
Sub. 3,Buffer 3This soil property in Canada watershed
were hard coded in SWAT-REMM prototype
SWAT-REMM PROTOTYPE users have to modify soil properties in riparian buffers with local soil data
manually
Enhancement of SWAT-REMM system2. Reflects soil properties of riparian buffer zone at study watershed
Enhancement of SWAT-REMM system2. Can reflects soil properties of riparian buffer zone at study watershed
Enhancement of SWAT-REMM system3. Can consider multiple weather stations in riparian buffer zones
Subwatershed 1
Subwatershed 2
Subwatershed 3
Subwatershed 4
SWAT-REMM Prototype SWAT-REMM Enhanced
Enhancement of SWAT-REMM system3. Can consider multiple weather stations in riparian buffer zones
SWAT-REMM Prototype SWAT-REMM Enhanced
One representative weather station
Multiple weather stations
Enhancement of SWAT-REMM system3. Can consider multiple weather stations in riparian buffer zones
SWAT-REMM PrototypeSWAT-REMM Enhanced system
Enhancement of SWAT-REMM system4. Can consider NO3-N load in baseflow flowing into riparian buffer system
Enhancement of SWAT-REMM system4. Can consider NO3-N load in baseflow flowing into riparian buffer system
Enhancement of SWAT-REMM system5. SWAT-REMM enhanced system is now tightly coupled
click
Application ofSWAT-REMM Enhanced system
Study area, scenarios of riparian buffer systems
Application of Study Watershed (South Korea)
Scenarios of Riparian Buffer system
Scenarios of Riparian Buffer system
Results
Calibration and Validation , Application of the SWAT-REMM enhanced system
Calibration and Validation of Stream Flow
Daily Calibrationin year 2005
Daily Validationin year 2006
Calibration and Validation of T-N
Daily Calibrationin year 2005
Daily Validationin year 2006
Estimated reduction with Riparian Buffer System (RBS) Scenarios
Stream flow
Subwatershed
BeforeRBS
(m3/sec)
Buffer 10m(Scenario 1)
Buffer 5m(Scenario 2)
Buffer 1m(Scenario 3)
After RBS(m3/sec)
Reduction(%)
After RBS(m3/sec)
Reduction(%)
After RBS(m3/sec)
Reduction(%)
10 8.7 8.3 4.7 8.4 4.3 8.6 2.1 11 3.5 2.8 18.7 3.0 14.5 3.2 6.9 12 7.8 6.0 23.1 6.3 18.5 7.0 10.2
T-N
Subwatershed
BeforeRBS
(kg/year)
Buffer 10m(Scenario 1)
Buffer 5m(Scenario 2)
Buffer 1m(Scenario 3)
After RBS(kg/year)
Reduction(%)
After RBS(kg/year)
Reduction(%)
After RBS(kg/year)
Reduction(%)
10 86.6 73.7 14.8 77.5 10.5 80.6 6.9 11 18.3 10.5 42.4 12.6 31.3 13.8 24.5 12 75.8 34.8 54.0 48.7 35.7 51.9 31.6
Conclusions4
» ...is available to simulate riparian buffer system established at several subwatersheds
» …reflects soil properties of riparian buffer zone at study watershed
» ...considers multiple weather stations in riparian buffer zones
» ...considers NO3-N load in baseflow flowing into riparian buffer system
» ... is now tightly coupled
Conclusions SWAT-REMM enhanced system ...
» SWAT-REMM enhanced system was improved.
» Reduction efficiency was affected by riparian buffer width.
» However, REMM model in SWAT-REMM system was not calibrated and validated in this study.
» Still, several items in the enhanced SWAT-REMM System have to be improved.
Conclusions
I really appreciate Liu, Y., Yang, W. and Wang, X for sharing the SWAT-REMM prototype source codes and modules.
Http://www. Envsys.co.kr/E-mail:[email protected]
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