Group 1: Benchmarks from literature (exact solution)

This section describes a number of benchmarks for which an exact analytical solution can be found in the literature.

1.1. Study Case described in "Technisch Rapport Voorland Zettingsvloeiing"

Description

The example given in "Annex A - Case Study" of the Deltares report 1200503-001-GEO-0004 "Concept Technisch Rapport Voorland Zettingsvloeiing" of G.A. van den Ham & Co is used.
In this example, both global and detailed checks are completed on the basis of a (fictitious) dike section, which with regard to geometry and soil structure is typical of the Southwest Delta.
The dike has a height of NAP+5 m, a crest width of 3 m and a slope of 1:3.
The foreshore begins to imaginary toe of the dike at an elevation of NAP and is 60 m wide. The toe of the trench is NAP-15 m and has a slope of 1:6. The dike section is 800 m long. The phreatic level is at NAP-2 m.
The soil profile is as follows:

• from NAP+3.5 m to NAP+1 m: peat
• from NAP+1 m to NAP-5 m: silty clay
• from NAP-5 m to NAP-18 m: moderately to loosely compacted sand (Calais)
• from NAP-18 m to NAP-30 m: densely compacted sand

Benchmarks results

The details of the calculation can be found in annex A of the report. The main results are given in the table below. The global check fails but the detailed check passes.

D-Flow Slide results

Results of benchmark 1-1 for the Global Check