2024-03-28T12:15:13Z
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2022-12-13T02:21:35Z
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NON-LINEAR ANALYSIS OF RIVER WATER TEMPERATURE
河川水温の非線形解析
NON-LINEAR ANALYSIS OF RIVER WATER TEMPERATURE
佐渡, 公明
杉山, 一郎
中尾, 隆志
river water temperature
non-linear analysis
threshold value
equilibrium temperature
divergence
River water temperature has a great influence on the increase of phytoplankton and the habitat of fish, and it is dependent on hydraulic and meteorological elements. The surface heat balance, which is composed of net radiation, sensible and latent heat fluxes, is a non-linear function of water temperature. So a differential equation concerning river water temperature is non-linear. The surface heat balance has been treated as a regression quadratic equation of water temperature in some papers.
In this paper the following three trajectories of solution for one-dimensional non-linear heat balance equation are shown using Bernoulli's equation with a threshold value, convergence to an equilibrium temperature, constant value and divergence. The difference between non-linear and linear analyses of the river water temperature is investigated under some combinations of hydrological and meteorological elements.
journal article
公益社団法人 土木学会
application/pdf
水工学論文集
45
991
995
https://kitami-it.repo.nii.ac.jp/record/8103/files/2001_河川水温の非線形解析.pdf
jpn
http://doi.org/10.2208/prohe.45.991
c2001 公益社団法人 土木学会
open access