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Toward Modeling Erosion on Unpaved Roads in Mountainous Northern Thailand

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Toward Modeling Erosion on Unpaved Roads in Mountainous Northern Thailand TOWARD MODELING EROSION ON UNPAVED ROADS IN MOUNTAINOUS NORTHERN THAILAND A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAII IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN GEOGRAPHY MAY 2000 by Alan D. Ziegler Dissertation Committee: Thomas W. Giambelluca, Chair Ross A. Sutherland Everett A. Wingert Deborah Woodcock Guillermo H. Goldstein We certify that we have read this dissertation; and that it is, in our opinion, satisfactory in scope and quality as a dissertation for the degree of Doctor of Philosophy in Geography. chair ii Acknowledgments I thank the following folks for their help in this research: Asuh, Atabuu, Atachichi, and Aluong (brawn); Kalaya (the General); Yun, Mae and Paa (kinsmanship); Paluk and Nadi Lamu (sharing their home), S. Yarnasarn, Geography, Chiang Mai University (support in Chiang Mai); J. Pintong, Agriculture Dept., Chiang Mai University (soil analyses); J. F. Maxwell (plant taxonomy and drinks); Mike Nullet and John Allison (engineering prowess); Chumnien and Amphai (support in Bangkok); T.T. Vana (field assistance in Thailand); Alexis Lee, J. Bussen, N. Thompson, J. Nagle, C.T. Lee, and M. Gilbeaux (lab/field assistance in Hawaii); Don Plondke (GIS); Sathaporn Jaiaree, and Sawasdee Boonchee, the Soil and Land Conservation Division of the Dept. of Land Development, Bangkok and Chiang Mai offices (expertise); Yinglek Pongpayack, the Soil Analysis Division of the Dept. of Land Development, Bangkok (soil analyses); Servillano Lamer, Department of Agronomy and Soil Science, University of Hawaii (support at UH test facility); C. Southern, and R. Gouda (construction and design of rainfall simulation apparatus); D. Ko, P. Malaspina, and E. Lind, Integrated Training Area Management Division, Schofield Barracks (use of ITAM facility at Schofield); Midwest Industrial Supply, Inc. (freely providing Soil Sement™). I especially thank professors Thomas W. Giambelluca and Ross A. Sutherland for their advice, field assistance, and manuscript review during this project. This dissertation work was partially funded by the National Science Foundation Award (grant no. 9614259) and a seed money grant from the University of Hawaii. I was additionally supported by an Environmental Protection Agency Star Fellowship and a Horton Hydrology Research Award (Hydrological Section, American Geophysical Union); and I recieved travel money from the UH International Agreements Fund and the Arts and Sciences Advisory Council. iii Abstract Contributions of road networks and unstable agricultural activities to downstream sedimentation, water shortages, and flooding in mainland SE Asia are not easily determined because scientific understanding of runoff and erosion processes operating on roads is limited. This dissertation work, conducted within the Pang Khum Experimental Watershed (PKEW) in northern Thailand, ≤ -1 supports that owing to low saturated hydraulic conductivity (Ks 16 mm h ), Horton overland flow (HOF) generation occurs more frequently on unpaved PKEW roads than on other watershed surfaces having higher infiltrability (e.g., mean Ks for agricultural surfaces ranges from 130 to 320 mm h-1). Because of frequent HOF generation, the road system contributes to stream sedimenta- tion throughout the rainy season. The highly compacted (bulk density ≈ 1.45 Mg m-3) PKEW road surface typically underlies a layer of loose material of finite depth. Instantaneous sediment trans- port (St) on roads varies because the supply of easily transported surface sediment is constantly altered by overland flow events, traffic, road maintenance, and mass wasting events, both during and between storms. As surface material is removed during an overland flow event, normalized ≈ -1 ≈ -1 St declines from an initial peak rate of 3 g J to a steady rate of 0.5 g J . The mechanical stress associated with vehicle passes during a storm increases the availability of loose material, producing 2-4 fold increases in St and sediment concentration (Ct) values. Herein, rainfall simu- lation data, surveys of traffic phenomena, and soil property measurements were used to parame- terize the physics-based KINEROS2 model for simulating road runoff and erosion. During model validation, instantaneous discharge was simulated well (root mean squared error (RMSE) = 14%). However, because KINEROS2 equations do not “describe” road erosion processes accurately, St was simulated poorly (RMSE = 51.6%). To improve modeling, a methodology recognizing the dynamic erodibility (DE) of a road surface was introduced. By explicitly simulating removal of a layer of loose material, the DE modeling technique improved prediction of St (RMSE decreased to 35.4 %). Finally, a systematic approach is presented to implement DE modeling on any road surface where baseline erodibility and sediment availability can be quantified. iv Table of Contents Description Page Title page . .i Signature page . .ii Acknowledgments . .iii Abstract . .iv Table of contents . .v List of tables . .viii List of figures . .ix 1. Introduction . .1 1.1 IMPACTS OF UNSTABLE AGRICULTURAL PRACTICES AND ROAD SYSTEMS IN NORTHERN THAILAND . .1 1.2 THAILAND ROADS PROJECT . .2 1.3 OBJECTIVE OF THE DISSERTATION RESEARCH . .3 1.4 LAYOUT OF THE DISSERTATION . .4 2. Background . .5 2.1 STUDY AREA: PANG KHUM EXPERIMENTAL WATERSHED . .5 2.2 ROAD EROSION MODELING . .8 2.3 THE THREE-DIMENSIONAL ROAD PRISM . .9 3. Experiment I: Runoff Generation and Sediment Production on Unpaved Roads, Footpaths, and Agricultural Surfaces in Northern Thailand . .11 3.1 ABSTRACT . .11 3.2 OBJECTIVE . .12 3.3 METHODS AND MATERIALS . .12 3.3.1 Study site . .12 3.3.2 Simulation treatments . .12 3.3.3 Measurement of physical properties . .14 3.3.4 Rainfall simulator and plot design . .14 3.3.5 Simulation data collection and calculations . .16 3.3.6 Measuring road discharge during natural events . .17 3.3.7 Data analysis . .17 3.4 RESULTS . .18 3.4.1 Compaction indices . .18 3.4.2 Instantaneous discharge and time to runoff . .18 v 3.4.3 Sediment output . .20 3.4.4 Sediment concentration . .21 3.5 DISCUSSION . .22 3.5.1 Influence of compaction on Ks and runoff generation . .22 3.5.2 Erosion on path complexes . .23 3.5.3 Surface preparation and sediment transport . .24 3.5.4 Representativeness of the ROAD simulation data . .26 3.6 CONCLUSION . .30 4. Experiment II: Partitioning total erosion on unpaved roads into splash and hydraulic components: interstorm surface preparation and dynamic erodibility . .31 4.1 ABSTRACT . .31 4.2 OBJECTIVE . .31 4.3 METHODS AND MATERIALS . .31 4.3.1 Research sites . .31 4.3.2 Rainfall simulation experiments . .32 4.4 RESULTS . .34 4.5.1 Runoff data . .34 4.5.2 Sediment output data . .35 4.5 DISCUSSION . .36 4.5.1 Role of surface preparation in road erosion . .36 4.5.2 Dynamic erodibility and implications for modeling road erosion . .37 4.6 SUMMARY AND CONCLUSIONS . .40 COLOR PLATES . .41 5. Experiment III: Interstorm surface preparation and sediment detachment by vehicle traffic on unpaved mountain roads . .50 5.1 ABSTRACT . .50 5.2 OBJECTIVE . .50 5.3 METHODS AND MATERIALS . .51 5.3.1 Survey of vehicle usage and surface physical characteristics . .51 5.3.2 Rainfall simulation experiments . .51 5.3.3 Rainfall simulator and plot design . .52 5.3.4 Simulation data collection and calculations . .53 5.3.5 Statistical analysis . ..
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