INTERNATIONAL SYMPOSIUM ON EROSION AND LANDSCAPE EVOLUTION September 2011 Anchorage, Alaska
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1 INTERNATIONAL SYMPOSIUM ON EROSION AND LANDSCAPE EVOLUTION September 2011 Anchorage, Alaska Presentation No : Plastic Covered Cropping Systems: Runoff Patterns and Soil Erosion Rates Sebastian Arnhold University of Bayreuth, Germany
2 International Research Project TERRECO Complex TERRain and ECOlogical Heterogeneity Evaluation of Ecosystem Services in Mountainous Landscapes Services in Production vs. Water Yield and Water Quality Soil Loss, Sediment and Erosion Control
3 Study Area Source: Google 2011 Soyang Lake Watershed
4 Study Area Haean Catchment: Intensive Agriculture and Steep Slopes
5 Study Area Plastic Mulching Ridges Perpendicular to the Main Slope Contouring Conservation Practice Reduce Infiltration and Increase Runoff Erosion Prevention or Intensification??? Radish Fields in Haean 2009
6 Objective Research Question: How Does Plastic Mulching Affect Soil Erosion? Combination with Landscape Topography Interaction of Ridges and the Topography of the Entire Field Site Hypothesis: Shape of the Field Site Controls the Effect of Ridges Radish Fields in Haean 2009
7 Runoff and Erosion Measurement Multislot Flow Divider Runoff Collector Buckets with Divider Crown Runoff Collector Design after Bonilla et al and Flow Divider Design after Pinson et al. 2004
8 Runoff and Erosion Measurement Typical Dryland Fields on Steep Slopes in the Haean Catchment: Field 1: Concave Shape (Depression in the Center) Field 2: Convex Shape (No Depression)
9 Runoff and Erosion Measurement Runoff Collectors and Flow Dividers on Field 1 and 2
10 Field Topography Analysis Soil Surface Measurement: Tachymeter Source: Bavarian Environmental Agency
11 Field Topography Analysis Field 1 Field 2
12 Runoff and Erosion Measurement Field 1 Total Erosion 3650 kg/ha Field 2 Total Erosion 630 kg/ha
13 Erosion Modeling EROSION 3D: Process-based Soil Erosion Model Simulate the Effect of Landscape Topography on Runoff and Erosion Input Data: Field Site DEMs, Soil and Surface Parameters, Recorded Rainfall Data Scenario Simulation: 1. Ridges with Plastic 2. Ridges without Cover 3. Plane Surface
14 Erosion Modeling Model Calibration: Infiltration Capacity and Soil Erodibility Observed vs. Simulated: Field 1 Field 2
15 Erosion Modeling Field 1 Total Erosion 4180 kg/ha 2470 kg/ha 1020 kg/ha Field 2 Total Erosion 550 kg/ha 370 kg/ha 470 kg/ha
16 Erosion Modeling Ridges with Plastic Rill Erosion Across Ridges on Field 1 Ridges without Cover Plane Surface
17 Erosion Modeling Ridges with Plastic Ridges without Cover Plane Surface
18 Conclusions Case Study: Only 2 Field Sites, Only 1 Month of the Korean Monsoon Limitation of Modeling at Field Scale: Rill Erosion Processes, Surface Development No Extrapolation and General Conclusions at this Point Importance of Landscape Topography: Landscape Topography Controls the Effect of Ridge Cultivation on Soil Erosion Topography is a Key Factor for Evaluating Management Strategies in Complex Terrain
19 Acknowledgement: German Research Foundation (DFG) Korea Science and Engineering Foundation (KOSEF)
20 Thank You!!! Sebastian Arnhold Department of Soil Physics University of Bayreuth Universitaetsstrasse Bayreuth Germany sebastian.arnhold
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