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105 lines
4.3 KiB
Matlab
105 lines
4.3 KiB
Matlab
7 years ago
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function nswaves = fmikeos2ns(oswaves, LookUps, site, contour, location)
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% Written by Joshua Simmons (WRL) 03/11/2014
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% to transform waves from offshore (OS) to nearshore (NS) using MIKE21 model
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% oswaves - OS wave data - oswaves.Hsig(Significant wave height)/
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% oswaves.Tp1(Peak period)/oswaves.Wdir(Incident wave direction)
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% LookUps - MIKE21 wave model output in file "OEH_ARC_PointOutput.mat"
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% site - embayment of interest - i.e. 'Narrabeen'
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% contour - 10 or 15 (m) contour for NS output
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% location - either pure S co-ord (see Mitchell Harley's xyz2spz
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% transformation) or location.E and location.N - refers to output
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% location for NS waves (gets nearest MIKE21 point)
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%
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%V1.1 - updated by Joshua Simmons 21/01/2015 to patch Wamberal/Wanda
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%error.
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%find site and contour indices
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siteidx = getnameidx(LookUps(:,2), site);
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%apply fix for Wamberal and Wanda
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% from TM on 21/01/2015: "I've found an error in the .mat file for the
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% look-up tables; in the pdf I say that all output for all locations runs
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% north to south - for Wamberal and Wanda it seems I've output them south to north.
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% So if you are using output from these two sites, if you haven't realised already,
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% alongshore gradients will look inverted."
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for aa = 1:2;
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LookUps{6,1}{aa,1} = flipud(LookUps{6,1}{aa,1}); LookUps{6,1}{aa,1}(:,1) = flipud(LookUps{6,1}{aa,1}(:,1));
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LookUps{7,1}{aa,1} = flipud(LookUps{7,1}{aa,1}); LookUps{7,1}{aa,1}(:,1) = flipud(LookUps{7,1}{aa,1}(:,1));
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end
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if contour == 10
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contouridx = 1;
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elseif contour == 15;
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contouridx = 2;
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else
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error('Contour information not available, select either 10 or 15m contour')
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end
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%extract scenarios for easy lookup
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scenariosidx = getnameidx(LookUps(:,2), 'Offshore Wave Scenarios');
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scenarios = LookUps{scenariosidx,1};
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%get nearest location available for output
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Eouts = LookUps{siteidx,1}{contouridx,1}(:,2);
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Nouts = LookUps{siteidx,1}{contouridx,1}(:,3);
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if strcmp(site,'Narrabeen')
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%compares closes alongshore spacing (s) for log-spiral narrabeen
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xyz_data.x = cell2mat(Eouts);
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xyz_data.y = cell2mat(Nouts);
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xyz_data.z = zeros(size(Eouts));
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spz = xyz2spz(xyz_data,'NARRA');
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[~,locationidx] = min(abs(location-spz.s));
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else
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%gets nearest output point
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dists = sqrt((location.E-cell2mat(Eouts)).^2+(location.N-cell2mat(Nouts)).^2);
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[~,locationidx] = min(abs(dists));
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end
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fcount = 1;
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%loop through oswaves and lookup nswaves
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for ii = 1:length(oswaves.Hsig)
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tmpHs = oswaves.Hsig(ii);
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tmpTp = oswaves.Tp1(ii);
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tmpWdir = oswaves.Wdir(ii);
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%find closest scenario match
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[~,Hsidx] = min(abs(tmpHs-scenarios(:,1)));
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tmpHsround = scenarios(Hsidx,1);
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[~,Tpidx] = min(abs(tmpTp-scenarios(:,2)));
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tmpTpround = scenarios(Tpidx,2);
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[~,Wdiridx] = min(abs(tmpWdir-scenarios(:,3)));
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tmpWdirround = scenarios(Wdiridx,3);
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iter1ind = find(scenarios(:,3) == tmpWdirround);
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iter2ind = find(scenarios(iter1ind,2) == tmpTpround);
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iter3ind = find(scenarios(iter1ind(iter2ind),1) == tmpHsround);
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iter4ind = iter1ind(iter2ind(iter3ind));
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%now get ns lookup information if available
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if isempty(iter4ind)
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%get the closest wave height to scenario chosen
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[~,iter3ind] = min(abs(tmpHs-scenarios(iter1ind(iter2ind),1)));
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iter4ind = iter1ind(iter2ind(iter3ind));
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diffHs = scenarios(iter4ind,1)-tmpHs;
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disp(['No match found for oswaves(' num2str(ii) ') wave height off by ' num2str(diffHs) 'm']);
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end
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nstmp = LookUps{siteidx,1}{contouridx,1}{locationidx,4}(iter4ind,:);
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%store the values from the lookup table
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nswaves.Hsig(ii,1) = nstmp(1);
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nswaves.Hmax(ii,1) = nstmp(2);
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nswaves.Tp1(ii,1) = nstmp(3);
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nswaves.T01(ii,1) = nstmp(4);
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nswaves.Wdir(ii,1) = nstmp(5);
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nswaves.power(ii,1) = nstmp(6);
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end
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try
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nswaves.date = oswaves.date;
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nswaves.time = oswaves.time;
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nswaves.datenums = oswaves.datenums;
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catch
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nswaves.datenums = oswaves.datenums;
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end
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end
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