Modeling edge effects of tillage erosion

摘要: Abstract Tillage erosion has been recognized as an important factor in redistribution of soil over time and the development morphological changes within agricultural fields. Field borders, fences, vegetated strips that interrupt fluxes lead to creation topographic discontinuities or lynchets. When tillage tools preferentially throw one side are used repeatedly move direction, rather than alternating with each pass, they create berms at receiving tilled domain a “dead furrow” channel contributing side. However, even implements symmetrical throwing equally both lateral directions on flat surfaces may some beyond implement width so contribute formation just zone can affect water flow paths. We developed two-dimensional Erosion Landscape Evolution Model allows complex internal boundaries be defined simulation domain. In this paper we develop demonstrate techniques allow prediction edge-of-field by defining alternative boundary conditions. The derivation assumptions model presented then it is applied compared survey results from two field studies: experimental Coffeeville, Mississippi, where grass hedges were planted close elevation contours evaluate their effectiveness control measure monitored 16-year period; other set 0.1 ha plots located near Holly Springs, MS effect berm runoff partitioning was evaluated during 8-year study. Results ability correctly reproduce location magnitude loss accumulation. At averaging 20 cm downslope hedge deposition taking place slope ends led lynchets up 0.8 m high, average steepness cropped areas between decreased 7.2% 1993 about 3.7% 2009. repeated conducted next along hillslope bottoms height 13 cm, which significantly alter field-scale hydrological, erosion, sediment transport processes.