Introduction

Deltares Systems commitment to quality control and quality assurance has leaded them to develop a formal and extensive procedure to verify the correct working of all of their geotechnical engineering tools. An extensive range of benchmark checks have been developed to check the correct functioning of each tool. During product development these checks are run on a regular basis to verify the improved product. These benchmark checks are provided in the following sections, to allow the users to overview the checking procedure and verify for themselves the correct functioning of D-FLOW SLIDE.
The benchmarks for Deltares Systems are subdivided into five separate groups as described below:

• Group 1 – Benchmarks from literature (exact solution)
  Simple benchmarks for which an exact analytical result is available from literature.
• Group 2 – Benchmarks from literature (approximate solution)
  More complex benchmarks described in literature for which an approximate solution is known.
• Group 3 – Benchmarks from spreadsheets
  Benchmarks which test program features using Excel spreadsheets.
• Group 4 – Benchmarks generated by the program itself
  Benchmarks for which the reference results are generated using D-FLOW SLIDE.
• Group 5 – Benchmarks compared with other programs
  Benchmarks for which the results of D-FLOW SLIDE are compared with the results of other programs.

As much as software developers would wish they could, it is impossible to prove the correctness of any non-trivial program. Re-calculating all the benchmarks and making sure the results are as they should be will prove to some degree that the program works as it should. Nevertheless there will always be combinations of input values that will cause the program to crash or produce wrong results. Hopefully by using the verification procedure the number of times this occurs will be limited.
The benchmarks will all be described to such detail that reproduction is possible at any time. In some cases, when the geometry is too complex to describe, the input file of the benchmark is needed. The results are presented in text format with each benchmark description.
The input files belonging to the benchmarks can be downloaded from those pages.

Overview of the benchmarks

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.

Group 2: Benchmarks from literature (approximate solution)

This section uses the results of a by-hand calculation performed for three profiles of the Spui dike project:

• hmp 63.5 (Nieuw Beijerland)
• hmp 65.0 (between Oud Beijerland and Nieuw Beijerland)
• hmp 67.8 (oud Beijerland)

As the details of the calculation performed by hand are not available, those benchmarks are set in group 2.

hmp 63.5 (Nieuw Beijerland)

Description

Benchmark results

D-FLOW SLIDE results

hmp 65.0 (between Oud Beijerland and Nieuw Beijerland)

hmp 67.8 (oud Beijerland)

Group 3: Benchmarks from spreadsheets

This section contains tests that are missing in the other groups, for example for the CUR-113 method.

Group 5: Benchmarks compared with other programs

These benchmarks are intended to verify the advanced method by comparing D-FLOW SLIDE results with those from the older program SLIQ-2D, using both DOS and Windows version of this program.