河床地貌演变研究的计算方法

河床地貌演变研究的计算方法

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contributed at 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Chinese {{currentDetailLanguage}} Chinese

河床地貌演变研究的计算方法

1.   冲淤量的间接计算方法

(1)  泥沙浓度的垂直分布:

     

  式中,为距床面y处的浓度;为距床面a处的浓度;d为平均水深;,,为沉速;为泥沙阻力摩擦流速;K为卡门常数;F为与泥沙形状有关的常数;为水的密度,g为重力加速度,D为粒径。

(2)    断面输沙量:

      

式中,为断面平均浓度;V为水流断面平均流速;S为断面面积

2.   冲淤量的直接计算方法

(1)  长方体分割法:

设某一网格点位于I,j网格坐标的交点上,通过x=I,y=j按一定逻辑条

件选择参考点-,假设结点被所选参考点屏蔽,以为相对新原点,-用新坐标表示,求出结点的高程。则:

 

      式中:

        ;

        ;

       ;

       ;

       ;

        ;

        建立以为元面的网络节点矩阵{}

               

        则:

                

       式中,K为与网格分隔间隔相关的常数。

2)横断面分割法:

设横截面垂直于X轴,截面面积为Sx)。设截面总面积为:

                                            

则体积为:

设横截面垂直于Y轴,则体积为:

2)柱体分割法:

          为第i个等高面积,对每个x值成对的y坐标用(1,2),(3,4),…,(2n-12n)表示,n=1,2,3x被分割数为K,按序号1,2,3,…,K排列,则:

            

         式中,的下标K为分割序号,n为成对的y坐标序号。

             设等高距为Z,则:

                          

          式中,m为切割数。

3.河床等高线的面拟合光滑方法

                  

         式中,pq为常数;Z为参数(曲线从()变到()时,Z0变到1)。

         Xy满足条件:

             Z=0时:

         

             Z=1时:

         

         式中:

          

          

          

 

参考文献:

   

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How to Cite

《资源环境数学模型手册》 (2018). 河床地貌演变研究的计算方法, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/3211b2f0-793f-4136-898e-d985f70ed88f
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Last modifier : 
zhengzhong
Last modify time : 
2020-11-07
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Contributor(s)

initial contribute: 2018-12-04

Authorship

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

History

Last modifier : 
zhengzhong
Last modify time : 
2020-11-07
Modify times : 
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