online_scour:   Pier and abutment scour using Melville equation (1997)

        

Formula

ds = KyW KI Kd Ks Kθ KG

For abutment: KyW = KyL

For pier: KyW = Kyb


Reference



INPUT DATA:

[Example]

1. Stream/river [optional]:  

2. Select:      [SI units (metric) only].


3.  LEFT ABUTMENT

3a.  Length of left abutment Ll (m) [Click to enlarge]:     

3b.  Shape of left abutment [Click to enlarge]:   

3c.  Angle of alignment of left abutment θlo [0o ≤ θl ≤ 150o]:       

3d.  Does the left abutment extend to the main channel?:      


4.  RIGHT ABUTMENT

4a.  Length of right abutment Lr (m) [Click to enlarge]:       

4b.  Shape of right abutment [Click to enlarge]:   

4c.  Angle of alignment of right abutment θro [0o ≤ θl ≤ 150o]:       

4d. Does right abutment extend to the main channel?:      


5.  FLOW DEPTH

5a.  Flow depth in the main channel ych (m) [Click figure below to enlarge]:       

5b.  Flow depth in the flood channel yfl (m) [Click figure below to enlarge]:       


6.  FLOW VELOCITY

6a.  Flow velocity in the main channel vch (m/s):       

6b.  Flow velocity in the flood channel vfl (m/s):       


7.  PIER DATA

7a.  Shape of pier [Click figure below to enlarge]:     

7b.  Width of pier b (m) [Click figure below to enlarge]:       

7c.  Length of pier l (m) [Click figure below to enlarge] [leave blank if circular pier]:       

7d.  Angle of alignment of pier θo [0o ≤ θl ≤ 150o]:       

7e.  Where is the pier located? [Click figure below to enlarge]:     

7f.  [Shape of] pier cross-section [in the vertical]:      

7g.  If pier shape is nonuniform [in the vertical] (see answer to input 7f), please enter the following data; otherwise, leave blank [Click figure below to enlarge]:

  • Height z (m):       

  • Diameter D (m):       

  • Diameter D* (m):       


    8.  DEBRIS CONTAMINATION

    8a.  Is pier subject to debris contamination?:      

    8b.  If pier is subject to debris contamination (answer to input 8a is Yes), please enter the following data [otherwise, leave blank] [Click figure below to enlarge]:

    • Thickness Td (m):       

    • Diameter Dd (m):       


    9.  SEDIMENT DATA

    9a.  Median particle size d50 (m):       

    9b.  Is the geometric standard deviation of the particle size distribution σg ≤ 1.3?:      

    9c.  If sediment is nonuniform (answer to input 9b is No), please enter maximum particle size dmax (m) [otherwise, leave blank]:       


    10.  MANNING n

    10a.  Manning roughness coefficient for the main channel, n:       

    10b.  Manning roughness coefficient for the flood channel, n*:       


    11.  WIDTH OF THE FLOOD CHANNEL

    11a.  If left abutment extends to the main channel, please enter following data [otherwise, leave blank] [Click figure below to enlarge]:

    • Left width of the flood channel Ll*:       

    11b.  If right abutment extends to the main channel, please enter following data [otherwise, leave blank] [Click figure above to enlarge]:

    • Right width of the flood channel Lr*:     
  • OUTPUT:

    No data.

                

      Your request was processed at  05:58:14 pm on April 23rd, 2014   [ 140423  17:58:14 ].


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