WANG Min,LI Zhanbin,CUI Lingzhou,et al.Study on Spatial Variation of Geomorphology Multi-Fractal Characteristic in the Dali River Watershed[J].Research of Soil and Water Conservation,2017,24(05):178-181,188.
大理河流域地貌多重分形特征空间分异研究
- Title:
- Study on Spatial Variation of Geomorphology Multi-Fractal Characteristic in the Dali River Watershed
- 分类号:
- P642.2
- 摘要:
- 利用流域数字高程DEM，采用流域地貌多重分形模型及其实现方法，对大理河流域中的11条子流域地貌多重分形参数进行了计算，分析了其空间分异特点。结果表明：大理河流域地貌多重分形参数奇异指数的最小值αmin、地貌表面积分布最小概率子集的分形维数f（αmin）和最大概率子集的分形维数f（αmax）的平均值从上游至下游呈明显递减趋势，奇异指数最大值αmax和奇异指数变化范围Δα平均值从上游到下游呈递增趋势，说明最大坡度地貌单元出现在上游，最小坡度地貌单元出现在下游，大理河流域地貌形态变化自上游向下游趋于复杂。大理河流域左岸αmin和f（αmin）均值大于右岸，表明最大坡度地貌单元所占比例左岸较大；左岸Δf平均值大于右岸，表明右岸中最小坡度的地貌单元所占比例大于最大坡度地貌单元所占比例；Δα均值右岸大于左岸，表明大理河右岸地貌复杂程度相对较大；总体来说，大理河流域地貌右岸的差异性、不均匀性和复杂度均大于左岸。该研究对于探讨黄土地貌多重分形参数的地貌学意义具有重要参考价值。
- Abstract:
- Based on the digital elevation model (DEM) of eleven subwatersheds of the Dali River watershed, the geomorphology multi-fractal parameters were calculated by using watershed geomorphology multi-fractal model and its spatial variation was also analyzed. The mean values of the geomorphology multi-fractal parameters, including αmin, f(αmin) and f(αmax), obviously decreased from the upstream to downstream. The mean values of αmax and Δα showed increasing trends from the upstream to downstream. The results indicated that the proportion of geomorphic unit with higher slope was more than with lower slope in the upstream, whereas the proportion of geomorphic unit with lower slope was more than with higher slope in the downstream. The topographic features of the Dali River watershed became more complex from the upstream to downstream. The mean values of αmin and f(αmin) on the left bank were greater than on the right bank of the Dali River watershed, which suggested that the proportion of geomorphic unit with higher slope on the left bank was more. The mean value of Δf on the left bank was more than on the right bank, which suggested that the proportion of geomorphic unit with higher slope on the right bank was more. The mean value of Δα on the right bank was more than on the left bank, which indicated that the topographic features on the right bank were more complex than on the left. In a word, the topographic features on the right bank were more divergent, homogeneous and complex than on the left bank. The results are of great scientific significance to effectively resolve the complex issues and master the characteristics of various landforms in geomorphology.
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备注/Memo
收稿日期:2017-01-18;改回日期:2017-03-28。
基金项目:国家重点研发计划项目（2016YFC0402404）；国家自然科学基金项目（51479180）
作者简介:王民(1973-),男,河南省唐河县人,博士,高级工程师,主要从事水土资源与生态环境方面研究。E-mail:thwmg@126.com
通讯作者:崔灵周(1971-),男,陕西省蓝田县人,博士后,主要从事流域地貌分形特征量化模型等方面研究工作。E-mail:clingzhou@126.com