Morphological Characteristics and Developmental Change Mechanisms of Erosion Gully in Baiquan County During 2003-2021
[Objective]The morphological features of eroded gullies in rolling hill areas of black soil in Northeast China and temporal-scale variations in their morphology.were analysed in order to provide a scientific basis and empirical data to understand the development and evolution of erosional gullies in this area.[Methods]This study selected 61 typical gullies in Guofu Town,Baiquan County,China.Unmanned aerial vehicle technology was used to generate digital elevation models and manually interprets parameters such as gully length and width-to-depth ratio.Historical aerial imagery data were used to analyse the developmental changes and influencing factors of gullies.[Results]① From 2003 to 2021,gully development in Baiquan County showed an overall intensification trend,with medium-sized gullies accounting for 60.66％of the total gullies.② A significant variation was observed in gully morphology within the study area,with gully length,average cross-sectional area,and volume mainly distributed between 41.89-1 173 m,11.23-440.69 m2,and 895.38-107 686.57 m3,respectively.The overall shape parameter distribution was concentrated.③ Gully length,area,and shape index exhibited a trend of increase followed by a decrease,with an average development rate of 9.64 m/a for length and 246.39 m2/a for area.The erosion gullys showed narrow and irregular shape.④ Regression analysis revealed significant positive correlations between gully length and width,perimeter,and area(S),and significant relationships between top width and bottom width,perimeter,and S,with determination coefficients of 0.82,0.23,and 0.58,respectively.However,gully depth showed a low correlation with erosion volume and S.[Conclusion]In typical areas of Baiquan County,the general trend in gully erosion has shown a relative slowdown compared with previous assessments,although gully erosion remains severe.Furthermore,there is an interrelationship among different morphological parameters,with gully length showing a close positive correlation with the area and perimeter of the eroded gullies.
erosion gullythe black soil region in Northeast Chinamorphological parameterslaw of developmentBaiquan County
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