沙尘输送模型的数值解及其敏感性分析
发布时间：2018-07-14 17:58
【摘要】：本文采用了内蒙古地区2000年5月1日~5月4日的NCEP再分析资料风场数据,通过数值实验来模拟二维和三维沙尘输送模型的沙尘输送过程,并研究了二维输送模型对初值和参数K_(ph)的敏感性,进一步研究了三维输送模型对参数K_(ph)和参数K_(pz)的敏感性.实验结果表明:(1)利用有限差分方法来数值求解二维沙尘输送模型,模拟的结果符合实际的沙尘输送过程.进一步通过对初值和参数分别添加初值扰动和参数扰动实验得出,二维沙尘输送模型对初值在一定范围内敏感性不强,对参数K_(ph)在一定的小扰动范围内非常敏感.(2)利用有限差分方法来数值求解三维沙尘输送模型,分别研究了300m、700m和800m处不同时刻沙尘的发展变化,模拟的结果符合实际的沙尘输送过程.进一步通过对参数K_(ph)和参数K_(pz)分别添加参数扰动实验得出,三维沙尘输送模型对参数K_(ph)和参数K_(pz)在一定的小扰动范围内很敏感.本文通过分析沙尘输送模型对参数的敏感性,将数学与大气科学紧密结合,对有关沙尘模式方面的研究具有理论方面的指导意义。
[Abstract]:In this paper, the wind field data of NCEP reanalysis data from May 1 to May 4, 2000 in Inner Mongolia region are used to simulate the dust transport process of two-dimensional and three-dimensional dust transport models through numerical experiments. The sensitivity of the two-dimensional transport model to the initial value and the parameter K _ (ph) is studied, and the sensitivity of the three-dimensional transport model to the parameter K _ (ph) and the parameter K _ (pz) is also studied. The experimental results show that: (1) the two-dimensional dust transport model is numerically solved by using the finite difference method, and the simulation results are in line with the actual sand dust transport process. Further, by adding initial value disturbance and parameter disturbance to the initial value and parameter, it is concluded that the two-dimensional sand dust transport model is not sensitive to the initial value in a certain range. K _ (ph) is very sensitive to the parameter K _ (ph) in a certain range of small disturbances. (2) using finite difference method to numerically solve the three-dimensional dust transport model, the development and variation of sand dust at different times at 300m ~ 700m and 800m are studied, respectively. The simulated results are in accordance with the actual sand and dust transport process. Furthermore, by adding parameter disturbance to parameter K _ (ph) and parameter K _ (pz), it is shown that the model of three-dimensional sand dust transport is sensitive to parameter K _ (ph) and parameter K _ (pz) in a certain range of small disturbances. By analyzing the sensitivity of the dust transport model to the parameters, this paper closely combines mathematics with atmospheric science, which is of theoretical significance to the study of sand dust model.
【学位授予单位】：河南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O241.8
本文编号：2122502
[Abstract]:In this paper, the wind field data of NCEP reanalysis data from May 1 to May 4, 2000 in Inner Mongolia region are used to simulate the dust transport process of two-dimensional and three-dimensional dust transport models through numerical experiments. The sensitivity of the two-dimensional transport model to the initial value and the parameter K _ (ph) is studied, and the sensitivity of the three-dimensional transport model to the parameter K _ (ph) and the parameter K _ (pz) is also studied. The experimental results show that: (1) the two-dimensional dust transport model is numerically solved by using the finite difference method, and the simulation results are in line with the actual sand dust transport process. Further, by adding initial value disturbance and parameter disturbance to the initial value and parameter, it is concluded that the two-dimensional sand dust transport model is not sensitive to the initial value in a certain range. K _ (ph) is very sensitive to the parameter K _ (ph) in a certain range of small disturbances. (2) using finite difference method to numerically solve the three-dimensional dust transport model, the development and variation of sand dust at different times at 300m ~ 700m and 800m are studied, respectively. The simulated results are in accordance with the actual sand and dust transport process. Furthermore, by adding parameter disturbance to parameter K _ (ph) and parameter K _ (pz), it is shown that the model of three-dimensional sand dust transport is sensitive to parameter K _ (ph) and parameter K _ (pz) in a certain range of small disturbances. By analyzing the sensitivity of the dust transport model to the parameters, this paper closely combines mathematics with atmospheric science, which is of theoretical significance to the study of sand dust model.
【学位授予单位】：河南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O241.8
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