地理学报 ›› 1996, Vol. 51 ›› Issue (2): 147-154.doi: 10.11821/xb199602008

• 论文 • 上一篇    下一篇

山地、湖泊的三维大气-斜压水动力学耦合模式──在日本琵琶湖水-气系统中的应用

张利民, 濮培民   

  1. 中国科学院南京地理与湖泊研究所,南京210008
  • 收稿日期:1994-02-01 修回日期:1994-09-01 出版日期:1996-03-15 发布日期:1996-03-15

A BARACLINIC AIR-WATER DYNAMIC COUPLING MODEL AND ITS APPLICATION IN THE AIR-WATER SYSTEM OF LAKE BIWA

Zhang Limin, Pu Peimin   

  1. Nanjing institute of Geography & Limnology, Academia Sinica,Nanjing 210008
  • Received:1994-02-01 Revised:1994-09-01 Online:1996-03-15 Published:1996-03-15

摘要: 大气、湖泊的边界层是大气边界层和湖泊边界层两部分组成的,它们之间通过湍流交换连接在一起,形成一整体系统。经过分界面的动量通量是连续的,热量是守恒的。基于此,本文在近几年工作的基础上,建立了大气边界层与水动力学模式的耦合模型,并对日本琵琶湖进行了实验研究,获得了一些比正压和均匀风场模式更符合观测实际的结论:(1)无论夏季(SSW)和冬季(NNE)作用下,湖面均可形成正的风涡度场;(2)夏季时,风的正涡度场对形成琵琶湖中观测到的环流特征起着十分重要的作用,而且还构造出与环流相匹配的深水区低、浅水区高的温度场;(3)夏季时,初始温度场的水平分布特征对模式结果的影响很小;(4)冬季时,湖中无明显水平环流生成。

关键词: 水-气耦合模式, 琵琶湖, 数值模拟

Abstract: The research work of the coupling model of atmospheric boundary layer with hydrodynamics is an advanced subject in physical limnology. Yukio Oonishi etc.(1975), Casulli,V.and Cheng RT (1992), Zic K, Patterson JC etc.(1992), Zhang Limin etc.(1994) have made many numerical studies in limnology. But all the above works only concerned one of the two factors, separating lake from atmosphere.While studying hydrodynamics, they supposed that the air and temperature fields over the lake were homogeneous. but the hypothesis had much difference from reality.Because of dynamic and thermal difference between water surface and land around a lake, there form character istically inhomogenous wind. temperature, and humidity fields, and these factors have many effectson current and temperature in the lake, and thus forms a special environment. A numerical model coupling a tmosphere with hydrodynamics is set up in this paper,and it applied in the experimental study of Lake Biwa.Some results are got:(1) Whatever (SSW)in summer or(NNW)in winter,there exists a positive wind-stress curl over a lake;(2) In summer the positive wind-stress curl pays an important role to form circulation in a lake and produces a special temperature field corresponding to circulation, lower in the deep water, higher in the shallow water;(3) In summer, the hypothsis of initial horizontal inhomogeneous water temperature has little efftect on the results of simulation;(4)In winter, there is no obvious circulation formed in the lake.

Key words: Air-water couPling model, Lake Biwa, Numeric Simulation

中图分类号: 

  • P343.1