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Oeverinscharing zandwinput Bergweg, Overijssel, 1997

This document contains the requirements and functional design for a software kernel that computes the safety assessment of the failure mode flow slide.

Requirements

The functional requirements for D-FlowSlide are:

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  Figure 1: Assessment schema for flow-slide

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1. Every computation by D-FlowSlide deals with one surface level and a 1D Soil profile.
   
   
2. The original surface line as used in DAM or Ringtoets (WTI) contains a whole set of characteristics points. D-FlowSlide needs only a subset.

1. 
   
   
2. The safety assessment consists of passing through different phases: 

A
• • A Global
check
• • check according to the global assessment rules
as given in the VTV-2006 and Handreiking Voorland Zettingsvloeiingen of Deltares:
• A Global check for liquefaction
• • given in Toetsmethode zettingsvloeiing (versie 2, 22 februari 2016) ; A Global assessment is solely based on geometric characteristics of under water slope and levee,
  • A Detailed check
A Global check for breaching
A Detailed check
• • according to the probabilistic assessment method described
in the Handreiking Voorland Zettingsvloeiingen;
• • in Toetsmethode zettingsvloeiing (versie 2, 22 februari 2016); In the detailed check also soil properties are taken into account. 
  • An Advanced check
, using two
• •  is usingthe  two advanced programs of Deltares
, that give no direct assessment result (approved, disapproved, etc), but can be used for further advanced (probabilistic) analysis
• • :
  SLIQ2D for the
  • • • Advanced check for static liquefaction
  ;HMBreach/HMTurb for the
  • • • , using the original program Sliq2D
      • Advanced check for breach flow, using the original program HMBreach.

  
  

  In the folowing paragraphs the functional  design for D-FlowSlide has been explained. Detailed documentes can be found in the literature list

   

  The definition of the symbols used in this Background section can be found in the Symbols sub-section.the Symbols list.

  Assessment scheme D-Flow Slide

  
  The figure below shows the assessment scheme for D-Flow Slide, which largely corresponds with the steps in the safety assessment in WBI2017.

  
  Figure 1: Assessment scheme for D-Flow Slide

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