基于模拟退火算法的林分多目标经营动态可视化模拟
Dynamic Visual Simulation of Stand Multi-Objective Management Based on Simulated Annealing Algorithm
投稿时间:2019-08-05  修订日期:2019-10-10
DOI:
中文关键词:  空间结构函数  模拟退火算法  林分多目标经营  单木生长方程  动态可视化模拟
英文关键词:Spatial structure function  Simulated annealing algorithm  Forest multi-objective management  Single-tree growth equation  Dynamic visualization simulation
基金项目:国家重点研发计划课题(2017YFD0600905)
作者单位E-mail
沈康 中国林业科学研究院资源信息研究所 1109651913@qq.com 
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中文摘要:
      摘要:[目的] 基于模拟退火算法,研究一种考虑林分结构健康状况和目标平均胸径的多目标森林经营方法,同时结合单木生长方程,基于Unity3D可视化引擎实现林分经营动态可视化模拟。[方法]以湖南省攸县黄丰桥国有林场5块杉木人工纯林2012-2017年样地连年调查数据为数据源,考虑林分分布状况、竞争程度、营养空间,以平均角尺度、平均大小比、林分拥挤度三个结构参数建立空间结构函数。在此基础上,以健康林分结构和平均胸径为经营目标,以竞争指数为参考初步筛选出的间伐木组合排列的结果作为经营方案的集合,通过模拟退火算法进行最优间伐经营方案解的选择。最后,通过建立考虑Hegyi竞争指数的可变生长率的单木生长方程,以结构分析-经营-生长三者不断迭代的方式并基于Unity3D渲染引擎实现林分经营动态可视化模拟。[结果]通过对5号样地(初始林分230株树,年龄16年,平均胸径20.21cm)以健康林分结构和30cm林分平均胸径为经营目标进行经营动态可视化模拟,结果表明林分年龄在21、26、31年分别进行过间伐模拟,当林分年龄31年间伐后,林分平均胸径达到30.10cm,林分平均角尺度为0.64,林分拥挤度为0.74,林分结构接近健康水平。[结论]本文提出的基于模拟退火算法的林分多目标经营动态可视化模拟方法能够模拟在多目标经营需求下的林分动态,并且形象直观,可以进一步为林业科研和生产提供支持。
英文摘要:
      Abstract: [Objective] Based on the simulated annealing algorithm, a multi-objective forest management method considering the health status of the stand structure and the average diameter of the stand was studied. At the same time, the single-tree growth equation was used to realize the dynamic visualization of the stand Management based on the Unity3D visualization engine. [Method]Based on the 2012-2017 survey data of 5 Chinese fir forests sample in Huangfengqiao State-owned Forest Farm in You County, Hunan Province, considering the distribution status, competition degree and nutrient space of the stand, the spatial structure function is established by three structural parameters: average angular scale, average size ratio and forest congestion degree. On the basis of the spatial structure function, the healthy forest structure and the average DBH are taken as the management objectives. The results of the different thinning trees( the reference of the competition index) combinations as are taken as the set of management plannings. The simulated annealing algorithm is used to select the optimal thinning mangement planning. Finally, by establishing a single-trees growth equation considering the variable growth rate of the Hegyi competition index, the structural analysis-management-growth method is continuously iterated and the dynamic visualization of the forest management based on the Unity3D rendering engine. [Results] The dynamic visualization of the management dynamics was carried out on the No. 5 plot (the initial forest stands 230 trees, age 16 years, average diameter 20.21 cm) with the healthy stand structure and the average diameter of 30 cm stand. The results showed that the stand was simulated thinning in 21, 26, and 31 years. When the forest age was 31 years old, the average diameter of the forest reached 30.10cm, the average angular scale of the forest was 0.64, and the forest congestion was 0.74. achieved to health level under thinning. [Conclusion] The dynamic visual simulation method of forest multi-objective management based on simulated annealing algorithm proposed in this paper can simulate the forest dynamics under multi-objective management demand, and the image is intuitive, which can further support forestry scientific research and production.
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