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Title: MyProject2.aprx
Author:
Comments: Climate data for the Hauraki Gulf
Richard Gorman
May 2012
1.a Files with wave & wind statistics (ARC-grid ASCII format for the 200m Hauraki Gulf grid):
Haur_mrg_HSig_mean2_201101to201112.asc Mean value of significant wave height (m)
Haur_mrg_HSig_50pctl_201101to201112.asc 50th percentile (median) value of significant wave height (m)
Haur_mrg_HSig_90pctl_201101to201112.asc 90th percentile value of significant wave height (m)
Haur_mrg_HSig_95pctl_201101to201112.asc 95th percentile value of significant wave height (m)
Haur_mrg_HSig_99pctl_201101to201112.asc 99th percentile value of significant wave height (m)*
Haur_mrg_WindSpeed_mean2_201101to201112.asc Mean value of wind speed (m/s)
Haur_mrg_WindSpeed_50pctl_201101to201112.asc 50th percentile (median) value of wind speed (m/s)
Haur_mrg_WindSpeed_90pctl_201101to201112.asc 90th percentile value of significant wind speed (m/s)
Haur_mrg_WindSpeed_95pctl_201101to201112.asc 95th percentile value of significant wind speed (m/s)
Haur_mrg_WindSpeed_99pctl_201101to201112.asc 99th percentile value of significant wind speed (m/s)
Haur_mrg_Urms_mean2_201101to201112.asc Mean value of root-mean-square bed orbital velocity (m/s)
* percentiles of Urms were computed, but still contain artefacts
* the 99th percentile of Hsig also seems to contain some artefacts
1.b Files with tidal statistics (ARC-grid ASCII format for the 200m Hauraki Gulf grid):
SSH_amp_net.asc Amplitude (m) of the 'net' tidal sea level height variation
Uprin_net.asc Amplitude (m/s) of the 'net' tidal current principal component (semi-major axis)
Vperp_net.asc Amplitude (m/s) of the 'net' tidal current transverse component (semi-minor axis)
Orient_net.asc Orientation (degrees) of the 'net' tidal current ellipse
Correl_net.asc Correlation of the 'net' tidal current
SSH_amp_M2.asc Amplitude (m) of the M2 constituent of tidal sea level height variation
SSH_phase_M2.asc Phase (degrees) of the M2 constituent of tidal sea level height variation
U_amp_M2.asc Amplitude (m/s) of the M2 constituent of eastward tidal current U_phase_M2.asc Phase (degrees) of the M2 constituent of eastward tidal current V_amp_M2.asc Amplitude (m/s) of the M2 constituent of northward tidal current V_phase_M2.asc Phase (degrees) of the M2 constituent of northward tidal current Uprin_M2.asc Amplitude (m/s) of the M2 constituent of tidal current principal component (semi-major axis)
Vperp_M2.asc Amplitude (m/s) of the M2 constituent of tidal current transverse component (semi-minor axis)
Orient_M2.asc Orientation (degrees) of the M2 constituent of tidal current ellipse
Correl_M2.asc Correlation of the M2 constituent of tidal current
* M2 (period 12.4206 hours) is the dominant tidal constituent. If required, similar results for other constituents.
* the 'net' tidal variation (current or sea level) is the root-mean-square sum of the combined tidal motion.
2.Grid
The grid uses a Lambert conformal projection with central meridian lon0 = 175.4; standard parallel lat0 = -36.5
Spatial resolution is 200m. As this may not be a "standard" GIS projection, the WGS84 coordinates of each cell are in
ARC-GIS grid files:
Hauraki_mrg_lon.asc
Hauraki_mrg_lat.asc
and the bathymetry (depth in m below Chart datum) is in
Hauraki_mrg_bth.asc
and the same data in XYZ format is in
Hauraki_mrg_xyz.txt
3. Bathymetry
The bathymetry used is based on the following sources:
a. Gerris Terrain database, specified as follows:
% L = Domain size (metres)
L = 409600;
% Use a Lambert conformal conic projection centered on a specified
% longitude and latitude. Rotate the domain by <angle>
% degrees.
% MapProjection { lon = 175.4 lat = -36.5 angle = 0 }
lon0 = 175.4; lat0 = -36.5; angle = 0; % Refine the quadtree to 11 levels everywhere i.e. the resulting
% mesh is regular, Cartesian with 2048x2048 grid points.
maxlevel = 11;
The resulting domain was reduced to cover the range lonrange = [174.4; 176.4];
latrange = [-37.5; -35.435];
needed to cover the Marine Park.
b. For the southern Hauraki Gulf, 100m gridded bathymetry ('bathy_DHI.txt') used recently in DHI (Mark Pritchard) and SWAN (Nigel Goodhue) modelling was used, with a linearly-weighted transition over a 10 km scale.
This bathymetry was based on the original 750m Kerry black grid, but with high-resolution data added for many parts
(e.g. estuaries).
Bathymetry processing from these original sources was done in Matlab, using
O:\BBES1202\Working\wave_climate\bathy\haur_bth2.m
4. Wave climate methodology
Sources:
a. NZWAVE_12 - Regional wave forecasts at ~12 km resolution run operationally under EcoConnect
b. AKLWAVE_1 - A wave model for the Auckland region at ~1km resolution. Boundary data for this
are produced by the operational NZWAVE_12 forecasts.
The AKLWAVE_1 simulation is the preferred source, but that grid only covers longitudes [173.8333 to 175.6667]
and latitudes [-37.3333 to -35.4444], which is not the full extent of the HGMP.
For the present work, one year (2011) of outputs from these models were used. This time range can be extended if necessary in future work.
The postprocessing code interp_ww3gnc was used to interpolate achived outputs from the respective simulations to
the Hauraki Gulf output grid, at each time step in the simulation. For points close to shore, the interpolated significant wave height is corrected by a scaling factor dependent on fetch in the upwave direction. RMS Bed orbital
velocity is then estimated from the corrected significant wave height, peak wave period, and the local water depth.
Interp_ww3gnc was run for one month at a time, outputting monthly mean values of all interpolated statistics, and
monthly occurrence distributions of significant wave height, wind speed and RMS bed orbital velocity.
The monthly occurrence and mean statistics were then merged to form corresponding statitics over the full study period (Jan 2011 to Dec 2011), and percentile values were derived, for both the NZWAVE_12 and AKLWAVE_1 outputs.
For economy, only gridpoints within 25 km of the coast were processed this way: for more distant points means and percentiles for Hsig and Wind speed computed on the NZWAVE_12 grid points (i.e. at ~12 km resolution) were used, and interpolated to the output grid.
Finally, the means and percentiles from the AKLWAVE_1 and NZWAVE_12 sources were merged, using linear smoothing over a 0.5 degree transition zone.
Details: 4.1. In O:\BBES1202\Working\wave_climate\Hauraki\
Matlab script cmp_blockfac.m was used to select output points on the Hauraki Gulf grid, and compute a file Hauraki_NZW12_fetch.txt of fetch-dependent blocking factors for processing NZWAVE_12 outputs on interp_ww3gnc.
Matlab script fudge_akl_blockfac2.m subsamples that list to provide a similar file Hauraki_AKL1_fetch_adj2.txt
for AKLWAVE_1 outputs, and also adjusts the nominal longitudes to correct an inconsistency in the AKLWAVE_1 grid.
4.2. On the HPFC blade fc-1, under /home/gorman/wave_interp:
./Hauraki/interp_all.sh calls ./Hauraki/interp_YYYYMM.sh for each month.
./Hauraki/interp_YYYYMM.sh $YYYYMM calls /home/gorman/build/postproc/interp_ww3gnc to process one month of NZWAVE_12
data, from archived files ww3g_*_utc_nzwave_12.nc
writing output files
Hauraki_NZW12_mean_wavestats_$YYYYMM.txt and
Hauraki_NZW12_<var>_Oc_$YYYYMM.txt for <var> = Hsig, WindSpeed, Urms
on fc-1, under /home/gorman/wave_interp:
./Hauraki_AKL/interp_all.sh calls ./Hauraki_AKL/interp_YYYYMM.sh for each month.
./Hauraki_AKL/interp_YYYYMM.sh $YYYYMM calls /home/gorman/build/postproc/interp_ww3gnc to process one month of AKLWAVE_1
data, from archived files ww3g_*_utc_aklwave_1.nc
writing output files
Hauraki_AKL1b_mean_wavestats_$YYYYMM.txt and
Hauraki_AKL1b_<var>_Oc_$YYYYMM.txt for <var> = Hsig, WindSpeed, Urms
4.3. In O:\BBES1202\Working\wave_climate
Matlab script all_pdfs.m merges the monthly occurrence distributions
Matlab script cmp_pctl.m computes percentiles from those
4.4. In O:\BBES1202\Working\wave_climate/Hauraki
Matlab script mrg_means.m merges NZWAVE_12 and AKLWAVE_1 mean values
Matlab script mrg_pctl.m merges NZWAVE_12 and AKLWAVE_1 percentile values
5. Tidal analysis methodology.
Tidal constituents for sea surface height and currents were interpolated from the EEZ tidal model to a lat/lon grid at resolution .0025 degrees in longitude by .002 degrees in latitude, approximately matching the 200m Hauraki Gulf grid.
Output file: tide_coeffs_hgmp.nc
(this was done in /gorman/running/HGMP on fc-1 with tidegr2nc)
These constituents were then interpolated to the Hauraki Gulf grid, 'net' tidal constituents calculated, and written to ARC-grid format (using the Matlab script O:\BBES1202\Working\wave_climate\tide\tideplots.m).
The methods were adapted from those used in the TTR phase 1 project, see:
\\niwa.local\projects\wellington\TTR10302\Working\wave_tide\
for a report with some write-up.
Subject: Mean Tidal Amplitude (m) across the Hauraki Gulf Marine Park
Category:
Keywords: Tidal Amplitude,Hauraki Gulf
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