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  • Ψ5m =  -0.03
  • D50 = 180 μm and D15 = 130 μm for Calais sand
  • D50 = 160 μm and D15 = 110 μm for Compacted sand 
  • According to the values of D50, the sand type is set to "Very fine sand"
  • Cohesive layers factor = 0.2
  • Migration velocity = 0.0001 mm/year

...

The local critical profile given in Table A.4.2a from CUR113b is modeled in D-Flow Slide for both type of sand (not too medium fine and fairly coarse sand). 

Different cases are considered:

CaseType of sandNumber of flat bermDescriptionExpected result for breaching 
Anot too medium fine sand   0The surface line coincides with the critical (local) profile given in Table A.4.2a from CUR113b  Fail
B0The surface line is steeper than the critical (local) profile given in Table A.4.2a from CUR113b (local slope are 1:X-0.1m instead of 1:X)Fail
C0The surface line is softer than the critical (local) profile given in Table A.4.2a from CUR113b (local slope are 1:X+0.1m instead of 1:X)Pass
D0The surface line is softer than the critical (local) profile given in Table A.4.2a from CUR113b, but is steeper than the critical average profile at one point onlyFail
Efairly coarse sand0The surface line coincides with the critical (local) profile given in Table A.4.2a from CUR113b  Fail
F0The surface line is steeper than the critical (local) profile given in Table A.4.2a from CUR113b (local slope are 1:X-0.1m instead of 1:X)Fail
G0The surface line is softer than the critical (local) profile given in Table A.4.2a from CUR113b (local slope are 1:X+0.35m instead of 1:X)Pass
H0The surface line is softer than the critical (local) profile given in Table A.4.2a from CUR113b, but is steeper than the critical average profileFail
Inot too medium fine sand   0The surface line is softer than the critical (local) profile given in Table A.4.2a from CUR113b (local slope are 1:X+0.1m instead of 1:X), but the channel is deeper than 40m.Fail

...

The soil has grain diameters of D50 = 200.1 μm and D15 = 100.1 μm, which corresponds to "Medium fine" Not too fine sand " soil type.

The local and average checks for all the points along the channel slope fail, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Not too fine Medium fine sand"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
2600      
254 -32222FailFail
250-52222FailFail
239.5-8.532.411832.5FailFail
235-1032.532.5FailFail
219-1442.928643FailFail
215-154343FailFail
190-2053.553.5FailFail
160-256464FailFail
120-3084.666784.67FailFail
70-35105.4286105.43FailFail
20-40106106FailFail

...

The soil has grain diameters of D50 = 200.1 μm and D15 = 100.1 μm, which corresponds to "Not too Medium fine" sand " soil type.

The local and average checks for all the points along the channel slope fail, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Not too Medium fine sand"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
2560      
250.3 -31.91.922FailFail
246.5-51.91.922FailFail
236.35-8.52.92.311832.5FailFail
232-102.92.432.5FailFail
216.4-143.92.828643FailFail
212.5-153.92.943FailFail
188-204.93.453.5FailFail
158.5-255.93.964FailFail
119-307.94.566784.67FailFail
69.5-359.95.3286105.43FailFail
20-409.95.9106Fail

Fail

...

The soil has grain diameters of D50 = 200.1 μm and D15 = 100.1 μm, which corresponds to "Not too Medium fine" sand " soil type.

The local and average checks for all the points along the channel slope pass, so the Global check for Step 7 - Breaching passes.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Not too Medium fine sand"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
2640      
257.7-32.12.122PassPass
253.5-52.12.122PassPass
242.65-8.53.12.511832.5PassPass
238-103.12.632.5PassPass
221.6-144.13.028643PassPass
217.5-154.13.143PassPass
192-205.13.653.5PassPass
161.5-256.14.164PassPass
121-308.14.766784.67PassPass
70.5-3510.15.5286105.43PassPass
20-4010.16.1106PassPass

...

The soil has grain diameters of D50 = 200.1 μm and D15 = 100.1 μm, which corresponds to "Not too Medium fine" sand " soil type.

The local and average checks for all the points along the channel slope pass except for one point for which the average check fails, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slopeCritical profile from CUR table A.4.2a

for "Not too fine sandMedium fine sand"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
263.830      
257.53-32.12.122PassPass
253.33-52.12.122PassPass
242.65-8.53.052.491232.5PassFail
238-103.12.582532.5PassPass
221.6-144.13.016143PassPass
217.5-154.13.088343PassPass
192-205.13.591353.5PassPass
161.5-256.14.09364PassPass
121-308.14.760884.67PassPass
70.5-3510.15.5236105.43PassPass
20-4010.16.0956106Pass

Pass

...

The soil has grain diameters of D50 = 500.1 μm and D15 = 250.1 μm, which corresponds to "Fairly coarse sandCoarse sand/Gravel" soil type.

The local check for all the points along the channel slope fails, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slopeCritical profile from CUR table A.4.2a

for "Fairly coarse sandCoarse sand/Gravel"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
1700      
164-32222FailFail
160-52222FailFail
153-8.52222FailFail
150-102222FailFail
138-1432.285732.3333FailFail
135-1532.333332.3333FailPass
120-2032.532.5FailFail
100-2542.842.8FailFail
80-304343FailFail
50-3563.428663.43FailFail
20-4063.7563.75Fail

Fail

...

The soil has grain diameters of D50 = 500.1 μm and D15 = 250.1 μm, which corresponds to "Fairly coarse sandCoarse sand/Gravel" soil type.

The local and average checks for all the points along the channel slope fail, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Fairly coarse sandCoarse sand/Gravel"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
1660      
160.3-31.91.922FailFail
156.5-51.91.922FailFail
149.85-8.51.91.922FailFail
147-101.91.922FailFail
135.4-142.92.185732.3333FailFail
132.5-152.92.233332.3333FailFail
118-202.92.432.5FailFail
98.5-253.92.742.8FailFail
79-303.92.943FailFail
49.5-355.93.328663.43FailFail
20-405.93.6563.75Fail

Fail

...

The soil has grain diameters of D50 = 500.1 μm and D15 = 250.1 μm, which corresponds to "Fairly coarse sandCoarse sand/Gravel" soil type.

The local and average checks for all the points along the channel slope pass, so the Global check for Step 7 - Breaching passes.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Fairly coarse sandCoarse sand*/Gravel"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
1840      
176.95-32.352.3522PassPass
172.25-52.352.3522PassPass
164.03-8.52.352.3522PassPass
160.5-102.352.3522PassPass
147.1-143.352.655732.3333PassPass
143.75-153.352.683332.3333PassPass
127-203.352.8532.5PassPass
105.25-254.353.1542.8PassPass
83.5-304.353.3543PassPass
51.75-356.353.778663.43PassPass
20-406.354.163.75Pass

Pass

...

The soil has grain diameters of D50 = 500.1 μm and D15 = 250.1 μm, which corresponds to "Fairly coarse sandCoarse sand/Gravel" soil type.

The local and average checks for all the points along the channel slope pass except for one point for which the average check fails, so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Fairly coarse sandCoarse sand/Gravel"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
171.840      
165.69-32.052.0522PassPass
161.59-52.052.0522PassPass
154.42-8.52.052.0522PassPass
151.34-102.052.0522PassPass
139.3-143.012.324332.3333PassFail
136.25-153.052.372732.3333PassPass
121-203.052.54232.5PassPass
100.75-254.052.843642.8PassPass
80.5-304.053.044743PassPass
50.25-356.053.47463.43PassPass
20-406.053.79663.75Pass

Pass

...

The soil has grain diameters of D50 = 200.1 μm and D15 = 100.1 μm, which corresponds to "Not too Medium fine" sand " soil type.

The local and average checks for all the points along the channel slope pass but the channel is deeper than 40m (which is not covered by the CUR table), so the Global check for Step 7 - Breaching fails.

Inputted profile along channel slope

Critical profile from CUR table A.4.2a

for "Not too Medium fine sand"

Result Global check - step 7 per point

X

[m]

Z

[m +GL]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local slope

[1:xxx]

Average slope

[1:xxx]

Local checkAverage check
274.10      
267.8 -32.12.122PassPass
263.6-52.12.122PassPass
252.75-8.53.12.511832.5PassPass
248.1-103.12.632.5PassPass 
231.7-144.13.028643PassPass
227.6-154.13.143PassPass
202.1-205.13.653.5PassPass
171.6-256.14.164PassPass
131.1-308.14.766784.67PassPass
80.6-3510.15.5286105.43PassPass
20-4110.16.1976106PassPass

...