地理科学 ›› 1987, Vol. 7 ›› Issue (1): 1-8,101.doi: 10.13249/j.cnki.sgs.1987.01.1

• 论文 •    下一篇

中国西部现代雪线的趋势面分析

蒋忠信   

  1. 铁道部第二勘测设计院第三总队 昆明
  • 出版日期:1987-01-20 发布日期:1987-01-20

TREND SURFACE ANALYSIS OF THE EXISTENT SNOWLINE IN WEST CHINA

Jiang Zhongxin   

  1. The Second Institute of Railroad Survey and Design
  • Online:1987-01-20 Published:1987-01-20

摘要: 中国西部现代雪线的一次趋势面,为一向东北方倾斜的平面,二次趋势面为一向东北方倾伏的"背斜"。表明纬度、距东海距离和地势是影响中国西部现代雪线高度H的主要因素。H决定于水平地带性、海陆分布和地势起伏。

Abstract: The analysis of twenty five existent snowline elevation values in west China indicates that snowline elevation H (meter) presents zonality change declining from south to north with latitude φ(degree) and the change declining from west to east.with longitude,which relates to distance L (kilometer) to east coastline.Therefore,first order trend surface equation of the snowline in west China is:
H=7800+0.444L-110φ Its goodness of fit is 82.53%.The equation shows a plane inclined southwest to northeast.Second order trend surface equation of the snowline in west China is:
H=2.957L+554.9φ-0.0001151L2-0.05354-6.991φ2-7555
Its goodness of fit reaches 93.39%.The equation represents really distribution law of the snowline in west China.Its form resembles a "overturning anticline" from southwest to northeast.The "raised axis" seems to be superimposed upon first order trend surface,which reflects the effect of relief. The snowline elevation in west China depends on horizontal zonality,the distribution of ocean and land,and the relief.