生态地理区域系统界线划分的物元模型

生态地理区域系统界线划分的物元模型

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Initial contribute: 2018-12-04

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:  
岳天祥编著
:  
yue@lreis.ac.cn
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Application-focused categoriesNatural-perspectiveLand regions

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生态地理区域系统界线划分的物元模型

 

(1)物元模型指标及其数值:

1)计算干燥度指数公式:

 

式中,为年或生长季的潜在蒸散量,潜在蒸散量的计算采用的是经过改进之后的彭曼模型,为了修正这一模型所得的数值在温带地区偏大的问题,在模型中增加了修正系数;为年或生长季的降水量;为随季节而变异的系数, 11~2月为0.6, 5~8月为0.8,其余各月为0.7,全年平均为0.75

 

2)经典域、节域和待识别物元的确定:

根据可拓集合理论,将区域自然景观变化的概念集合(半湿润---半干旱区)逐渐变化的关系,由定性描述扩展为定量描述,以便识别式中的层次关系。设P = {半湿润---半干旱区}, ={半干旱区},则对于任何试判断是否属于,并计算的程度。

经典域物元:

 

节域物元


(2)根据距的定义,计算待识别样本单指标关联函数值

距的计算:

关联函数值的计算公式:

式中,为单指标关联函数,其他符号的含义与取值与前面相同。

 

(3)各指标权重的确定:

层次分析( AHP )和专家集成的方法:

首先找出与半湿润、半干旱区界限划分有关的各个因子,然后将这些因子按关联隶属度关系构成递阶层次模型。通过对层次结构中各因子的相对重要性判断,进行层层排序。以此为基础,着眼于各因子在界线附近的实际空间分异程度,结合前人的经验,经专家集成,客观地做出了4个指标的权重值。即年干燥度指数,生长季干燥度指数,土壤水分盈亏量,年降水量

 

(4)待识别样本的多指标综合关联函数的计算(计算隶属程度):

 

式中,属于的程度,并且当时,(半干旱区);当时,而当时,

运用上述公式可以求出各地的关联函数,即隶属程度,并识别各地是属于半湿润区还是半干旱区。

 

参考资料

张军涛,李哲,郑度:基于可拓工程方法的生态地理区域系统界线划分研究。地理学报, 2001, 56(1)

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《资源环境数学模型手册》 (2018). 生态地理区域系统界线划分的物元模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/c3048419-697e-49e5-aae4-b3c236219d73
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wu kai
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Authorship

:  
岳天祥编著
:  
yue@lreis.ac.cn
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wu kai
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