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DSD-INT 2018 Using XBeach for estimating wave conditions inside harbors - Sequeiros

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Presentation by Octavio Sequeiros, Shell, Netherlands, at the XBeach User Day 2018, during Delft Software Days - Edition 2018. Thursday, 15 November 2018, Delft.

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DSD-INT 2018 Using XBeach for estimating wave conditions inside harbors - Sequeiros

  1. 1. Shell RESTRICTED 1 Wave in harbour modelling with XBeach Study for Funchal (Madeira) and Santa Cruz (Tenerife) Deltares XBeach User Day, 15th Nov 2018 Octavio E. Sequeiros Metocean Team – Shell
  2. 2. Shell RESTRICTED From offshore to nearshore wave conditions (shallow waters) 2 Santa Cruz Tenerife Funchal  Hindcast data from nearest offshore data point (Global Wavewatch III Hindcast database).  Delft3D-WAVE transformation modelling.  Refraction, shoaling, white capping, bottom friction effects.  2014 year transformed to metocean data just outside each harbour.
  3. 3. Shell RESTRICTED 3 Buoy 28.46 N, 16.23 W Model 28.476 N, 16.225 W  Puertos del Estado buoy 1421, Santa Cruz de Tenerife 2009-2017,  28.46 N, 16.23 W, at 56 m wd Nearshore wave: model reality check with buoy data Buoy Model 0 5 10 15 20 25 30 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Frequency[%] Hs [m] Buoy Model 0 5 10 15 20 25 30 2 4 6 8 10 12 14 16 18 20 Frequency[%] Tp [sec] Buoy Model
  4. 4. Shell RESTRICTED Tenerife – (within harbour) 4 Instantaneous wave field in Santa Cruz, Tenerife (30-min XBeach run for selected metocean state) time  elevation(m) point 1 0:00 0:05 0:10 0:15 0:20 0:25 0:30 -1.5 -1 -0.5 0 0.5 1 1.5 Santa Cruz berth location  XBeach software (wave-resolving, non-hydrostatic) to model inner harbour waves (diffraction and reflection) no_advec b.c. Diffraction Reflection Refraction
  5. 5. Shell RESTRICTED Funchal – (within harbour) 5 XBeach output inner harbour conditions in Funchal Max wave height in sea state Instantaneous wave field XBeach input as boundary condition is Delft3D nearshore output  Smaller harbour  But better positioned respect offshore wave climate  Better vessels location within harbour Funchal berth location
  6. 6. Shell RESTRICTED Conclusions  XBeach quite useful to estimate wave conditions inside harbour (under time and other constraints)  30-min long simulations for each sea state  Time step = 0.2 sec  Tenerife (nx = 445 ny = 635) → Computational time ~2-3 days in remote blade  Funchal (nx = 300 ny = 650) → Computational time ~2 days in remote blade  Solution to speed up. Run several simulations at the same time  Items to improve  Use cyclic boundary conditions on the side to avoid spurious reflection  Reassess inlet boundary condition water depth to better satisfy XBeach recommendations (e.g. best kd<1, not greater than 3)  Tenerife kd = 1.8-2.4  Funchal kd = 1.1-1.9  Use variable roughness to account for breakwater material 6

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