北京师范大学学报（自然科学版）2016，Vol.52Issue(3)：350-355,6.DOI:10.16360/j.cnki.jbnuns.2016.03.016
巴丹吉林沙漠湖泊面积与水位的非线性关系模拟研究
Modeling the nonlinear relationship between lake area and water level in Badain Jaran Desert,China
摘要
Abstract
Badain Jaran Desert located on the Alxa Plateau in Inner Mongolia is the second largest desert in China.It is renowned for its tallest sand hills in the world as well as for about 100 lakes.The water level in the lakes ranges from 1150 m and 1200m above the sea level.Previous studies have suggested higher water levels in the past 30 ka.Assuming that shapes of sand dunes and inter-dune depressions do not change,distribution of lakes and total lake area during those high-lake-level periods could be modeled from three-dimensional shape of the landscape.The 90 m-resolution DEM data are used to analyze relationship between area of the plan with an equal height and elevation of the plan in several typical depressions.Relationship is found to be approximated with two kinds of nonlinear equations:power or polynomial functions.In most cases third-order polynomial equation is available.The bottom elevation of a lake basin is usually unknown due to the lack of lake depth data.It can be estimated by nonlinear equations with optimized parameters for best fitting on area-level data in zone above the lake surface,but with certain uncertainties.This has no impact on rebuilding shape and size of lakes with higher water levels in history.关键词
沙丘/湖泊/数字高程/巴丹吉林沙漠Key words
sand dunes/lakes/digital elevation model (DEM)/Badain Jaran Desert分类
天文与地球科学引用本文复制引用
郑瑞兰,王旭升,胡晓农..巴丹吉林沙漠湖泊面积与水位的非线性关系模拟研究[J].北京师范大学学报（自然科学版）,2016,52(3):350-355,6.基金项目
国家自然科学基金资助项目(91125024) （91125024）
