边界条件对水库下游河床演变的影响模型

边界条件对水库下游河床演变的影响模型

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Initial contribute: 2018-12-04

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岳天祥编著
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yue@lreis.ac.cn
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Method-focused categoriesData-perspectiveGeoinformation analysis
Method-focused categoriesProcess-perspectivePhysical process calculation

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边界条件对水库下游河床演变的影响模型

1.河床抗冲性的定量指标

(1)抗冲性:

                   

式中,τC为河床(河底或河岸)物质底临界切力;τ为水流切力。

(2)河岸相对于河底的抗冲性:

                  

式中,KK分别表示河岸,河底抗冲性。

(3)河底抗冲性:

                     

式中,D为粒径;γ为水的比重;H为水深;J为比降。

(4)河岸抗冲性:

                 

(5)相对抗冲性的经验性指标:

                   

式中,M为河岸粉砂黏土含量;m为河岸边坡系数。

2.清水冲刷条件下的平衡纵比降

(1)Meyer-Peter公式:

               τc=K1γs-γ)D

式中,τc为临界切力;γsγ分别为水、沙的比重;D为平均粒径;K1为常数,等于0.047。

(2)清水冲刷条件下的平衡纵比降公式:

                    

3.河床边界条件与横断面调整的关系

(1)宽深比/h值的调整:

 

式中,R为河湾半径;复相关系数r=0.84;为低滩约束性,B0为低滩全部被淹没时的河宽;B0为常水位时的河宽;θ为主流顶冲角。

2)展宽率:

               手河底卵石层影响的点据用下式代表:

                   B展宽=0.9107-0.2657ln(r=-0.94)

               未受河底卵石层影响的点据用下式代表:

                   B展宽=0.3499-0.1447ln(r=-0.97)

(3)下切率:

              H下切=0.0408(-0.83(r=-0.89)

(4)下切、展宽演变趋势的判别分析:

式中,当Y<0时,下切为主;当Y>0时,展宽为主。

许炯心:边界条件对水库下游河床演变的影响——以汉丹江口水库下游河道为例。地理研究,1983,2(4)

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《资源环境数学模型手册》 (2018). 边界条件对水库下游河床演变的影响模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/d15aebbf-11fc-4d91-8c83-fbc1200c6348
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Last modifier
Zhiyi Zhu
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2020-11-14
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Contributor(s)

Initial contribute : 2018-12-04

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Authorship

:  
岳天祥编著
:  
yue@lreis.ac.cn
:  
View
Is authorship not correct? Feed back

History

Last modifier
Zhiyi Zhu
Last modify time
2020-11-14
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