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MIKE 2016 - and beyond MIKE 21 and MIKE 3 - the professional option

The most versatile software package for coastal and marine modelling

Poul Kronborg MIKE Powered by DHI pok@dhigroup.com

Module Overview for Marine MIKE Software: Release 2014

Hydrodynamics Sediments Environment Waves

MIKE 21/3 HD MIKE 21/3 ST (Sand transport)

MIKE 21/3 AD (Advection-

Dispersion)

MIKE 21 SW (Spectral Waves)

MIKE 21/3 MT (Mud transport)

MIKE 21/3 OS

(Oil Spill)

MIKE 21 BW (Boussinesq

Waves)

Others:

MIKE C-Map

MIKE Animator

LITPACK

ECO Lab

MIKE 21/3 PT

ABM Lab

Hydrodynamics Sediments Environment Waves

Dispersion)

MIKE 21 SM (Shoreline

Morphology)

MIKE 21/3 OS

(Oil Spill)

Waves)

ECO Lab

Others:

MIKE C-Map

MIKE Animator

LITPACK ABM Lab

MIKE 21/3 PT

MIKE Operations for Forecasting

Hydrodynamics Sediments Environment Waves Maritime

Dispersion)

MIKE 21 MA (Mooring Analysis)

MIKE 21 SM (Shoreline

Morphology)

MIKE 21/3 OS

(Oil Spill)

Waves)

ECO Lab

Others:

MIKE C-Map

MIKE Animator

Littoral Proc.

(New Litpack)

ABM Lab

MIKE 21/3 PT

Performance:

• Parallelization • Linux porting

• Support of GPU’s

• Remote Execution Facility

• SaaS (MIKE in the Cloud)

Marine MIKE software: Latest Developments

Productivity tools: • Scour Calculation Tool

• Enhancements of Climate Change Editor

• MIKE Animator enhancements

• Mesh Generation improvements

• Earthquake bathymetry adjustment

• New Cyclone Tool

• Fully Spectral Wave Boundary Generation

• Random Wave Generation Enhancements

• Software Development Kit

• US Units

Engine enhancements: • Nearfield/Farfield integration

• New dike structure with overtopping

• Structure Improvements

• Flather boundary and Q/h boundaries

• Time-varying bathymetries

• Litpack Re-engineering

• New Oil Spill Module

• Agent Based Modelling

Easy data access: • Introducing online WaterData

• Improvements in the Global Tide Model

Traditional Tools for Sediment Transport

• 2D model (MIKE 21 FM ST)

− Detailed sediment transport

patterns

− 2D effects included directly

− Relatively short time scale

(historically because of very long

simulation times)

− Morphology breaks down over

time, i.e. shape of coastal profile

becomes unnatural

• 1D shoreline model (LITPACK)

− Simulation of shoreline position on

long time scales

− 2D effects included using parametric

formulations

− No detailed sediment transport

patterns

− Parametric formulations work well in

simple cases, but not so well in more

complex cases, e.g. submerged

structure, off-shore breakwater on

complex bathymetry

MIKE 21 FM Shoreline Model Concept

• Concept similar to 2D model

• Constrained morphological

Shoreline Model Description

• Compute waves, currents and sediment transport

on 2D area mesh.

• Divide the near-shore area in strips perpendicular

to the shoreline

• Use modified one-line equation for shoreline

movement on each strip of shoreface:

𝑑𝑛

𝑑𝑡= −

ℎ𝑎

𝑑𝑄𝑙

𝑑𝑥

𝑑𝑛

𝑑𝑡=

𝑣𝑜𝑙

𝑑𝐴𝑧

• ha = Hdune+Dcld

• dn is movement of shoreline, dt is time step, vol is

deposited volume on strip, dAz is vertical area over

which to distribute vol.

Shoreline Model Description

For each edge element sediment

volumes are accounted for.

Each of the elements in the calculation

mesh (normally triangular) must

be assigned to an edge element

Example: Idealized Offshore Breakwater

Incoming wave direction • Alongshore periodic

domain

• Coastal profile: Dean

− z = 0.12 y2/3

• Off-shore profile: linear

− 1:500

• Boundary conditions:

− Hs = 1 m

− Tp = 5 s

− Mean dir: 345o

• Closure depth: 5 m

Example: Real Off-shore Breakwater

• Measured 5 years after construction

• Simulation period 5 years

• Volume of sediment accumulated behind breakwater shows good agreement

Measured Modelled

Example: Raf Raf, Tunesia

• 3 management schemes investigated

− 3 sub-merged breakwaters

− 5 sub-merged breakwaters

− Stabilizing groyne

• All including 350,000 m3 nourishment

Example: Raf Raf, Tunesia

Flow field details

MIKE 21 FM Shoreline Morphology Inputs

• The model is activated on

module selection pane

• Only possible to activate

if Hydrodynamic, Sand

Transport and Spectral

Waves are activated

Model Inputs

• The Shoreline model lives

in the Morphology section

of the Sand Transport

Module

• There are 6 subsections

where inputs to the

shoreline model are

specified

Speeding up HD solution during calm periods

• Set time step interval equal to overall time step of simulation

• Set tol1 and tol2 such that conditions are only met when boundary conditions and

forcing are constant

• Pre-process boundary conditions and forcing such that these are constant during calm

periods

Quasi-steady HD solver

• Solve equations in time

domain until specified time

step interval is met or until

• rms(dη/dt) < tol1

• rms(duv/dt) < tol2

• If conditions are not met

during specified time step

interval, solution is identical to

in-stationary solution

Example from Kerteh Beach, Malaysia

Sound is more than four times faster underwater

compared to air and there is less attenuation

Water is an excellent medium for sound

transmisson

Senses underwater

• Smell - No receptors

• Taste - Limited

• Touch – Short range

• Visual – Short range

• Sound – Effective, fast,

long-range

Frequency (kHz)

0.01 0.1 1 10 100

Bottlenose dolphin (Johnson 1967)

Risso's dolphin (Nachtigall et al. 1995)

Striped dolphin (Kastelein et al. 2003)

Killer whale (Szymanski et al. 1999; Behaviour)

Killer whale (Szymanski et al. 1999; ABR)

Harbour porpoise (Kastelein et al. 2002)

Marine mammal hearing

10 100 1000

Bass (Nedwell et al. 2004)

Cod (Offut 1974)

Cod (Hawkins & Myrberg 1983)

Dab (Hawkins & Myrberg 1983))

Bass (Nedwell et al. 2004)

Herring (Enger 1967)

Pollack (Chapman 1973)

Pollack (Chapman & Hawkins 1969)

Atlantic Salmon (Hawkins & Johnstone 1978)

Little Skate (Casper et al. 2003)

Fish hearing

Marine sound sources

Boyd et al. 2008

Impulsive and continuous sound

Detection

Response

Masking

TTS-PTS

Injury

• TTS =

Temporary

threshold shift

• PTS =

Permanent

threshold shift

Risk based approach to noise assessment

What is the problem?

How far does the sound spread?

How many animals are in range of the sound?

How do they react to the sounds?

How can we

mitigate

impacts?

Sound Speed in the Ocean

• Extremely dependent on temperature profile

• Surface layer

• Seasonal Thermocline

Risk management: Source mitigation

©Werner Piper

• New propeller designs

• Source dampening

• Better maintenance

Risk management: Channel mitigation

Helmholtz Resonator

(Wochner et al. 2015)

Hydro-sound

dampers

(Elmer et al. 2015)

IHC NMS

(Schiedek et al. 2015)

UAS – extension of the Split-Padé algorithm

a. Bathymetry

b. Temperature

c. Salinity

d. Seabed

e. Volume

attenuation

f. …etc.

New product: Underwater Acoustic Simulator (UAS)

Transsect Sound Exposure Level

UAS results give us:

• SEL for each frequency

• TL for each frequency

• SEL overall

• TL overall

• Min TL over depth (for each frequency)

• Max SEL over depth (for each frequency)

• Min overall TL over depth

• Max overall SEL over depth

SEL: Sound Exposure Level

TL: Transmission Loss

Applying obtained results one can:

Create graphs for one transect presenting: • SEL level change over depth and distance

from the source

• SEL level change with frequency and

distance from the source

Frequency in 1/3 octave bands (Hz)

Applying obtained results one can:

Create noise maps in the study area

by compiling modelling results from

different transects

Noise Impact Assessment

Following the steps above we can calculate the noise levels and impact ranges after

applying chosen mitigation measures -> how many animals will experience the

negative impact while mitigation is in place?

Case: Pile driving in the Baltic Sea Exposure criteria for harbour porpoise: Behavioural response for single strike:140 dB SEL unweighted; TTS for single strike: 164 dB SEL unweighted

Single strike, no mitigation Single strike with bubble curtain mitigation

Performance Improvements: GPU for MIKE 3

• OpenMP parallelization:

• Release 2005: MIKE 21 SW

• Release 2008: MIKE 21 FM

MIKE 3 FM

• Release 2009: MIKE 21 BW

MIKE 21 ‘Classic’

MIKE 3 ‘ Classic’

6 December, 2012 © DHI #37

• Porting of engines to Linux:

MIKE 21 FM

MIKE 3 FM

Release 2014, Use of GPU’s: MIKE 21 FM HD

• MPI parallelization:

MIKE 21 FM

MIKE 3 FM

Release 2016, Use of GPU’s: MIKE 3 FM HD

and Coupled Modelling with MIKE 21 and MIKE 3

Test.model: Gulf of Mexico

Mesh Element

Elements

Mesh A Triangular 32767 837746

Mesh B Triangular 65773 1675605

Mesh C Triangular 130524 3331724

Performance compared to a 16-core PC (MPI-parallelization)

Black line: 1 GPU

Red line: 2 GPU’s

Computer Processor Memory Operating

system

1 DELL Precision T7610

(workstation)

2 x Intel®Xeon®

E5-2687W v2 (8

cores, 3.40 GHz)

Windows 7

Professional

SP1, 64-bit

2 x GeForce

GTX Titan

Wave induced bed resistance in MIKE 21 and MIKE 3

In coastal regions, wave action influence the actual bed resistance, and

thus the current field, particularly during storms.

• Wave induced bed resistance is included as an option in MIKE 21

FM HD, MIKE 3 FM HD and in Coupled modelling.

• When this option is invoked, wave data and additional data

concerning botttom sediments must be specified.

First step in integrated near-field/far-field simulation: New source

feature

As the first step in integrated near-field/far-field

simulation, a new jet source has been added

to the list of source types.

Release 2014: When this type is selected a

steady jet is calculated and the vertical position

of the source position becomes dynamic (only

MIKE 3)

The method outlined by Jirka (2004) is used.

Release 2016: Next step in integrated near-field/far-field

simulation

• A number of general improvements of the method, particularly on the numerical

method, in particular inclusion of the upstream ambient flow approach.

Improvements in structures: Tidal Turbines

• The Tidal Turbine structure was introduced several years ago.

• Since then, extensive testing have identified possibilities for improvements in the

implementation

• As a result of this testing, in Release 2016 a Current Correction factor is included

Improvements in structures: Weir and Culverts

• Until now, a uniform distribution over

the structure has been applied

• In some cases, specifically with a

significantly varying water depths,

this gives incorrect results

• In Release 2016 a possibility for

choosing a nonuniform distribution

is included

New tool for qualified time series calibration:

Time Series Comparator

• A very common task in the calibration process is the comparison of two time

series; measured and calculated

• This tool makes this task easy and systematic:

− Produces relevant comparison plots

− Calculates various performance parameters

• A very common task in the calibration process is the comparison of two time

series; measured and calculated

• This tool makes this task easy and systematic:

− Produces relevant comparison plots

− Calculates various performance parameters

Introducing Internet Licensing

• Obtain a License from a server placed on the Internet

• Basically the same functionality as a network license

Key Features

• No dongles or other hardware involved

• Flexible, users portfolio of licenses can be changed on-line

• Direct insight into license usage

Flexibility

• System is compatible with existing license file structure, modules etc.

• Users can be licensed individually

• Users can share a pool of licenses for e.g. a company

JNH@dhigroup.com

MIKE 21 Mooring Analysis

Applications of MIKE 21 MA

Single Buoy Moorings

Passing Vessel Induced Vessel Response

Tandem Moored Vessels

Berth Operability/Downtime Analysis

Nearshore/Offshore Mooring Design

Floating Breakwaters

Floating Offshore Wind Turbines

Moored Vessels in Sheltered Areas

Overview of MIKE 21 MA

Accurate representation of vessel hull geometry and gyrostatic data.

Wave diffraction forces calculated from non-linear, nonuniform incident wave fields or flow fields produced by Mike21.

Implicitly resolves both bound and free long period waves in shallow water

Non-linear restoring forces due to mooring lines, fenders and posts

Frictional damping in the surge and roll modes due to scraping along a fender

Viscous surge and sway damping

Wind, current forces and 2nd order wave drift forces

Capabilities of MIKE 21 MA

New Oil Spill model: Subsea blowout and use of detergents

New Oil Spill model:

• Deep-sea blow-out

• Modelling of dissolved oil simultaneously with oil on the surface

• Skimmers, boomers, detergents, burning

• Introduction of a back-tracking facility.

• Pre/post-processing tool for the generation of a large quantity

of oil spill simulations and statistical post-processing of the results.

• Introduction of predefined oil parameters for more of oil types.

Langlitinden (study carried out for a Norwegain oil company)

• Barents Sea, including

Svalbard

• Northeast Norwegian Sea

• Approximately 1,000

simulations covering the whole

year and all rates and

durations, seabed and surface

discharge

• Simulates all combinations of

rates / durations and

discharge location with

associated probability

• Simulating different weather

situations for each

combination Model for Barents Sea

established by DHI for a

Norwegian oil company

•Flexible mesh, grid cells 8

km offshore, down to 1 km

at the coast and in the

fjords

•Tidal included

•Modeled current validated

against measurements

Surface spill

Whole year

5% p > 1 tonn

Seabed spill

Whole year

5% p > 1 tonnes

Surface spill

Whole year

Maximum concentration

of dissolved oil

Seabed spill

Whole year

Maximum concentration

of dissolved oil

Surface spill

Whole year

Seabed spill

Whole year Dissolved oil is transported by the sea

currents and is not a particle transport 0-½ day

½-1 day

1-5 days

5-10 days

10-20 days

20-30 days

Below 0.5 µg/l

0.5-1 µg/

1-3 µg/l

3-5 µg/l

5-7 µg/

MIKE Operations for Marine

Thank you

mike 2016 - and beyond - dhi content/presences/emea/portugal... · mike 2016 - and beyond mike 21...

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