Kangwon National University

Transcription

1 Kangwon National University

2 Ⅰ Introduction Ⅱ Ⅰ Methodologies Ⅲ Ⅰ Results Ⅳ Ⅰ Conclusions

3 Ⅰ Introduction

4 Using SWAT

5 1. Control the rising water temperature 2. Provide habitat for animal 3. Control the soil erosion 4. Control the NPS pollution

6 Riparian buffer in natural Riparian buffer in SWAT

7 SWAT SWAT Can Can NOT Simulate Vegetation Riparian Filter Buffer Strip

8 SWAT input variable that pertain to filter strips Conversion of Land Use to Forest

9

10 SWAT-REMM prototype model Agricultural Agricultural Agricultural Industrial Agricultural Buffer strip Agric ultura l Agri cult ural Residential Agricult ural Pasture Pasture Agricultural Agricult ural Commercial Residen tial Agricultural Agricultural

11 Multiple weather stations Reflection of soil properties at riparian buffer

12 Manually OR Automatically

13 for Auto-Calibration in current SWAT-REMM Limitations the riparian buffer should be specified along the reaches in every catchment in the watershed Current SWAT-REMM was NOT fully integrated Enable simulation of riparian buffer at user designated watershed Additions Develop automatic REMM input module through modification of SWAT engine Develop the REMM background run module Develop the auto-calibration module by adding REMM input parameters with Parasol Development

14 Ⅱ Methodologies

15 Selection of subbasin in riparian buffer zone Can simulate riparian buffer system established at several catchment Selection of riparian buffer zone Delineation

16 SWAT SWAT Auto-Calibration module Buffer Drainage Runoff Concentrated Drainage Can calibrate stream flow and water quality automatically Buffer drainage Sediment REMM Concentrated drainage Nutrient Runoff Sediment Nutrient Route to the Subbasin outlet Route to the Subbasin outlet Route to the watershed outlet Route to the watershed outlet Parasol Change SWAT Input Parameters Change REMM Input Parameters

17 Simulation of REMM in Current SWAT-REMM SWAT-REMM ver Manually Automatically Using background module SWAT Runoff Buffer drainage Sediment REMM Concentrated drainage Nutrient Runoff Sediment Nutrient Route to the Subbasin outlet Route to the watershed outlet

18 Study area

19 Scenarios of Auto-calibration Without Riparian buffer Scenario Established Riparian buffer Scenario

20 SWAT input data

21 Parameters of SWAT and REMM in PARASOL SWAT Lower Bound Upper Bound Variation Method Slsubbsn Multiplying initial value Slope Multiplying initial value Gwno Replacement by value Cn Multiplying initial value Gwqmn Replacement by value Alpha_Bf Replacement by value Slsoil Replacement by value REMM Lower Bound Upper Bound Variation Method Maximum Root Depth Maximum Leaf Area Index SWAT Auto-Calibration module REMM Scenario 21 : Established Without Riparian Riparian buffer buffer Runoff Sediment Nutrient Route to the Subbasin outlet Route to the watershed outlet PARASOL Replacement by value Change SWAT Input Parameters Change REMM Input Parameters Replacement by value

22 Ⅲ Results

23 양성평등및여성의지위향상 R 2 and NSE Scenario 1 Without riparian buffer Stream flow : R 2 = 0.97 NSE = 0.67 Total Nitrogen : R 2 = 0.64 NSE = 0.55 Scenario 2 With riparian buffer Stream flow : R 2 = 0.30 NSE = Total Nitrogen : R 2 = 0.11 NSE = l32

24 양성평등및여성의지위향상 Best parameters Scenario 1 Without riparian buffer Scenario Without Riparian buffer Slsubbasin Slope Gwno3 Cn2 Gwqmn Alpha_bf Slsoil + 25% - 25% % Scenario 2 With riparian buffer Scenario Slsubbasin Slope Gwno3 Cn2 Gwqmn Alpha_bf Slsoil Maximum Root Depth Maximum Leaf Area Index +10.9% -25% %

25 Ⅳ Conclusion

26 Development of SWAT-REMM ver Can be simulated riparian buffer at user designated watershed Can be calibrated flow and water quality automatically

27 Application of riparian buffer in SWAT Many swat applications to the watershed with riparian buffers without using SWAT-REMM system need to be re-inves tigated. Canopy scenario at riparian buffer could be simulated with SWAT-REMM 2012

28 Auto-calibration of stream flow and water quality SWAT-REMM auto-calibration module, developed in this study, c an be efficiently used to determined best SWAT and REMM parameters for watershed with riparian buffers.

29 Future study In the near future we will extend SWAT-REMM auto-calibration capabilities to consider other REMM input parameters. We will develop simple module to estimate pollutant load from buffer drainage by clipping HRU map with buffer draina ge boundary By 2012 we will develop new SWAT-REMM in open source MAP-WINDOW platform!!!

30 Homepage : www. Envsys.co.kr swatremm@gmail.com