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EnergyBalance.cc 6.55 KB
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/***********************************************************************************/
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/*  Copyright 2009-2015 WSL Institute for Snow and Avalanche Research    SLF-DAVOS      */
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/***********************************************************************************/
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/* This file is part of Alpine3D.
    Alpine3D is free software: you can redistribute it and/or modify
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    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

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    Alpine3D is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
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    along with Alpine3D.  If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <alpine3d/ebalance/EnergyBalance.h>
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#include <alpine3d/MPIControl.h>
#include <alpine3d/OMPControl.h>
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using namespace mio;
using namespace std;

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EnergyBalance::EnergyBalance(const unsigned int& i_nbworkers, const mio::Config& cfg, const mio::DEMObject &dem_in)
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              : snowpack(NULL), terrain_radiation(NULL), radfields(i_nbworkers), dem(dem_in), vecMeteo(),
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                albedo(dem_in, 0.), direct(), diffuse(), reflected(), direct_unshaded_horizontal(),
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                timer(), dimx(dem_in.getNx()), dimy(dem_in.getNy()), nbworkers(i_nbworkers)
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{
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	MPIControl& instance = MPIControl::instance();

	size_t startx = 0, nx = dimx;
	instance.getArraySliceParams(dimx, startx, nx);

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	#pragma omp parallel for schedule(static)
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	for (size_t ii=0; ii<nbworkers; ii++) {
		size_t thread_startx, thread_nx;
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		OMPControl::getArraySliceParams(nx, nbworkers, ii, thread_startx, thread_nx);
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		const size_t offset = startx + thread_startx;
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		#pragma omp critical(ebWorkers_status)
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		std::cout << "[i] EnergyBalance worker " << ii << " on process " << instance.rank() << " will start at offset " << offset << " with nx " << thread_nx << "\n";
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		radfields[ii] = new RadiationField(dem_in, offset, thread_nx);
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	}
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	if (instance.master())
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		std::cout << "[i] EnergyBalance initialized a total of " << instance.size() << " process(es) with " << nbworkers << " worker(s) each\n";
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	// Every MPI process will have its own copy of terrain_radiation object with full DEM
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	const bool enable_terrain_radiation = cfg.get("Terrain_Radiation", "EBalance");
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	if (enable_terrain_radiation) {
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		terrain_radiation = TerrainRadiationFactory::getAlgorithm(cfg, dem, nbworkers);
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		const std::string algo = terrain_radiation->algo;
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		if (instance.master())
			std::cout << "[i] Using terrain radiation with model: " << algo << "\n";
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	}
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}

EnergyBalance::~EnergyBalance() {
	Destroy( );
}

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EnergyBalance& EnergyBalance::operator=(const EnergyBalance& source) {
	if (this != &source) {
		snowpack = source.snowpack;
		terrain_radiation = source.terrain_radiation;
		radfields = source.radfields;
		dem = source.dem;
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		vecMeteo = source.vecMeteo;
		albedo = source.albedo;
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		direct = source.direct;
		diffuse = source.diffuse;
		reflected = source.reflected;
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    direct_unshaded_horizontal = source.reflected;
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		timer = source.timer;
		dimx = source.dimx;
		dimy = source.dimy;
		nbworkers = source.nbworkers;
	}
	return *this;
}

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std::string EnergyBalance::getGridsRequirements() const
{
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	return "TOP_ALB";
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}

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void EnergyBalance::Destroy()
{
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	while (!radfields.empty()) {
		delete radfields.back();
		radfields.pop_back();
	}

	if (terrain_radiation) {
		delete terrain_radiation;
		terrain_radiation = NULL;
	}
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}

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void EnergyBalance::setSnowPack(SnowpackInterface& mysnowpack)
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{
	snowpack = &mysnowpack;
}

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void EnergyBalance::setAlbedo(const mio::Grid2DObject& in_albedo)
{
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	albedo = in_albedo;
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	direct.resize(0, 0); //resetting these grids that are not valid anymore
	diffuse.resize(0, 0);
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	reflected.resize(0, 0);
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  direct_unshaded_horizontal.resize(0,0);
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}

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void EnergyBalance::setStations(const std::vector<mio::MeteoData>& in_vecMeteo)
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{
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	vecMeteo = in_vecMeteo;
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	direct.resize(0, 0); //resetting these grids that are not valid anymore
	diffuse.resize(0, 0);
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	reflected.resize(0, 0);
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  direct_unshaded_horizontal.resize(0,0);
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}

void EnergyBalance::setMeteo(const mio::Grid2DObject& in_ilwr,
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                             const mio::Grid2DObject& in_ta, const mio::Grid2DObject& in_rh, const mio::Grid2DObject& in_p, const mio::Date timestamp)
{
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	timer.restart();
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	direct.resize(dimx, dimy);
	diffuse.resize(dimx, dimy);
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  direct_unshaded_horizontal.resize(dimx,dimy);
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	#pragma omp parallel for schedule(dynamic)
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	for (size_t ii=0; ii<nbworkers; ii++) {
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		radfields[ii]->setStations(vecMeteo, albedo); //calculate the parameters at the radiation stations
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		size_t startx, nx;
		radfields[ii]->getBandOffsets(startx, nx);
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		radfields[ii]->setMeteo(mio::Grid2DObject(in_ta, startx, 0, nx, dimy),
		                       mio::Grid2DObject(in_rh, startx, 0, nx, dimy),
		                       mio::Grid2DObject(in_p, startx, 0, nx, dimy),
		                       mio::Grid2DObject(albedo, startx, 0, nx, dimy));
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		mio::Array2D<double> band_direct, band_diffuse;
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		radfields[ii]->getRadiation(band_direct, band_diffuse,direct_unshaded_horizontal);
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		direct.fill(band_direct, startx, 0, nx, dimy);
		diffuse.fill(band_diffuse, startx, 0, nx, dimy);
	}
	MPIControl::instance().allreduce_sum(direct);
	MPIControl::instance().allreduce_sum(diffuse);
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	if (terrain_radiation) {
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		// note: parallelization has to take place inside the TerrainRadiationAlgorithm implementations
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		terrain_radiation->setMeteo(albedo.grid2D, in_ta.grid2D, in_rh.grid2D, in_ilwr.grid2D);
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		terrain_radiation->getRadiation(direct, diffuse, direct_unshaded_horizontal, reflected);
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	}
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	if (MPIControl::instance().master())
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		cout << "[i] Ebalance simulation done for " << timestamp.toString(Date::ISO) << "\n";
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	if (snowpack) {
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		double solarAzimuth, solarElevation;
		radfields[0]->getPositionSun(solarAzimuth, solarElevation); //we need it only for handing over to snowpack
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		mio::Array2D<double> ilwr = in_ilwr.grid2D;
		mio::Array2D<double> global = direct+diffuse; //otherwise the compiler does not match the types
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		if (!reflected.empty()) global += reflected;
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		timer.stop();
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		try {
			snowpack->setRadiationComponents(global, ilwr, diffuse, solarElevation, timestamp); //this triggers Snowpack calculation
		} catch(std::exception& e) {
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			std::cout << "[E] Exception in snowpack->setRadiationComponents()\n";
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			cout << e.what() << endl;
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			std::abort(); //force core dump
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		}
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	}
	timer.stop();
}

double EnergyBalance::getTiming() const
{
	return timer.getElapsed();
}