PERGOS is Oceanweather's new comprehensive metocean study of the Gulf. As such it represents a major upgrade and update of Oceanweather's long history of regional specific studies carried out within this basin within the past 20 years. Those studies have essentially set the standard for metocean design data in the regions of interest to specific operators.

PERGOS is an upgrade of the previous studies because it utilizes hindcast models of higher resolution and more powerful physics than the previous studies. The wind and wave hindcasts were all made with basin-wide grids of spacing .0625 degrees in latitude and longitude (7 km), nested within coarser grid systems covering the Gulf of Oman and the Arabian Sea. 2-D surge and currents have been run for storms only with a grid spacing of .035° x .035°. These results have been merged with the storm wave hindcasts. The wave model incorporates third-generation physics (OWI3G version 52, half friction). All hindcast time series are available in either OWI's OSMOSIS format (for current licensees of OSMOSIS) or ASCII.

The historical storm population of PERGOS consists of 108 members spanning the years from 1961 - 2002. The number of storms is about a factor of three larger than typical of regional specific hindcast studies. The continuous hindcast now covers full two-decades (1983-2002) to ensure that it simulates the recent and current climate.

PERGOS includes specification of surface wind fields for the ocean response modeling based on a comprehensive surface meteorological database and Oceanweather's latest and most refined surface wind field kinematic reanalysis technology.

PERGOS may be licensed in the form of model output time series only, derivative normals and extreme statistics only, or both time series and statistics.

View Larger Image

View Larger Image

Mean Significant Wave Height for February 1983

1. Hindcast Time Series Files. Time series of winds, waves (surge and currents for storms, tides not included) are provided for hindcasts of at least 108 events drawn from the period 1961-2002 (1-hourly time steps). Time series of wind and waves (1-hourly time steps) are provided for the 20-year continuous period 1983-2002.

2. Extremes. Return-period extremes of wind speed, wave height and period and surge and 2-D currents (storms) are derived in both omni-directional and sector stratified form. The specific tables delivered are:

a) Omnidirectional return period extremes for 1, 5, 10, 25, 50 and 100 years

Wind speed (WS) 1-hour average (gust factors will be given for 1-minute and 3-second gust)
Significant wave height (HS)
Maximum individual wave height (HM)
Maximum individual crest height (HC)
Associated peak spectral wave period (TP)
Storm driven current speed (CS)
Storm driven positive storm surge height (SH)

b) Sector (45-degrees) stratified extremes for return period of 100 years:

HS and associated CS, TP, HM, HC, SH, WS
3. Normals. Fatigue and operability data expressed as monthly and annual frequency of occurrence tables of wind speed by wind direction (45-degree sectors), wave height by wave period and direction (45-degree sectors), and exceedance and non-exceedance duration statistics for wind speed and wave height.

4. Final Report. A Final Report (WORD or PDF) on PERGOS with block specific extremes and sample normals.

Time series and all derivative products delivered ASCII or alternatively, all products may be delivered as OSMOSIS formatted files (separate OSMOSIS License required).