长江水情的数值模式

长江水情的数值模式

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Initial contribute: 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Application-focused categoriesNatural-perspectiveLand regions
Application-focused categoriesHuman-perspectiveDevelopment activities
Application-focused categoriesIntegrated-perspectiveRegional scale

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长江水情的数值模式

 

通过数值求解Saint Venant方程组,建立描述长江水情的数值模式。

(1)基础方程式:

              

式中,z为水位(m);B为河宽(m);Q为流量(m3·s-1);t为时间;g为重力加速度(m2·s-1;A为过水断面面积(m2);K为抗阻模数;x为河口方向的横坐标。

(2)边界条件:

①上游边界区长江宜昌站流量过程,Q=Q(t);②下游边界取长江大通站水位流量关系,Q=Q(z);在长江干流与较大支流(清江、松滋口、太平口、藕池口、洞庭湖口、汉江和鄱阳湖口)的交界处,根据内部边界的连续和能量守恒条件,有:

                  

(3)预测计算:

应用Preissmann隐式格式对基本方程组进行数值离散,取θ表示格式的参数,建立描述长江水情的数值模式。计算时将宜昌至大通江段分为32个断面,取θ=0.65,时间步长Δt=1h。

姜加虎,黄群:三峡工程对鄱阳湖水位影响研究。自然资源学报,1997,12(3)

 

How to Cite

《资源环境数学模型手册》 (2018). 长江水情的数值模式, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/0aceaed1-bac3-4a4d-9dfb-6944f36ebb6b
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History

Last modifier : 
Zhiyi Zhu
Last modify time : 
2020-11-14
Modify times : 
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Contributor

Initial contribute: 2018-12-04

Co-contributor(s)

Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

History

Last modifier : 
Zhiyi Zhu
Last modify time : 
2020-11-14
Modify times : 
View History

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