online_scour_melville:   Pier and abutment scour using the Melville equation (1997)
        

Formula

ds = KyW KI Kd Ks Kθ KG

For abutment: KyW = KyL

For pier: KyW = Kyb

Reference

Melville, B. W., 1997. Pier and abutment scour: Integrated approach,
Journal of Hydraulic Engineering, ASCE, Vol. 123, No. 2, February, 125-136.
INPUT DATA:

[Description]    [Example Problem]   [Examples from the Reference]

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 y (m) [Click figure below to enlarge]:

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

6.  FLOW VELOCITY

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

6b.  Flow velocity in the flood channel V* (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]:      

[If pier is uniform, 7b and 7c are applicable; if pier is nonuniform, 7g is applicable]

7g.  If pier shape is nonuniform [in the vertical], 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.
    		             

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