Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/tkhcalculation/TkhCalculator.java @ 8964:45f1ad66560e

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Code cleanup concerning calculations: improved error handling; improved interpolation; bed heights are now always used for spatial discretisation
author gernotbelger
date Thu, 29 Mar 2018 15:48:17 +0200
parents 183f42641ab6
children b5600453bb8f
rev   line source
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1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by
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3 * Björnsen Beratende Ingenieure GmbH
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4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
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5 *
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6 * This file is Free Software under the GNU AGPL (>=v3)
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7 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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8 * documentation coming with Dive4Elements River for details.
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9 */
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10 package org.dive4elements.river.artifacts.sinfo.tkhcalculation;
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11
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12 import org.apache.commons.lang.math.DoubleRange;
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13 import org.dive4elements.river.artifacts.model.Calculation;
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14 import org.dive4elements.river.artifacts.sinfo.common.SInfoResultRow;
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15 import org.dive4elements.river.artifacts.sinfo.common.SInfoResultType;
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16 import org.dive4elements.river.artifacts.sinfo.tkhstate.BedHeightsFinder;
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17 import org.dive4elements.river.model.River;
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18
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19 /**
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20 * @author Gernot Belger
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21 */
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22 public final class TkhCalculator {
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23
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24 private static final int VALID_BED_MEASUREMENT_YEARS = 20;
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25
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26 private final BedQualityD50KmValueFinder bedMeasurementsFinder;
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27
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28 private final SoilKindKmValueFinder soilKindFinder;
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29
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30 private final BedHeightsFinder bedHeightsProvider;
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31
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32 private final WaterlevelValuesFinder waterlevelProvider;
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33
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34 private final DischargeValuesFinder dischargeProvider;
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35
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36 private final FlowVelocityModelKmValueFinder flowVelocitiesFinder;
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37
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38 public static TkhCalculator buildTkhCalculator(final boolean useTkh, final Calculation problems, final String label,
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39 final River river, final DoubleRange calcRange, final WaterlevelValuesFinder waterlevelProvider, final DischargeValuesFinder dischargeProvider,
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40 final BedHeightsFinder bedHeightsProvider) {
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41
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42 if (!useTkh)
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43 return new TkhCalculator(null, waterlevelProvider, dischargeProvider, bedHeightsProvider, null, null);
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44
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45 if (!dischargeProvider.isValid()) {
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46 problems.addProblem("sinfo_calc_flow_depth.warning.missingQ", label);
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47 return new TkhCalculator(null, waterlevelProvider, dischargeProvider, bedHeightsProvider, null, null);
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48 }
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49
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50 /* access bed quality data */
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51 final int soundingYear = bedHeightsProvider.getInfo().getYear();
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52 final BedQualityD50KmValueFinder bedMeasurementsFinder = BedQualityD50KmValueFinder.loadBedMeasurements(problems, river, calcRange, soundingYear,
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53 VALID_BED_MEASUREMENT_YEARS);
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54 if (bedMeasurementsFinder == null)
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55 return new TkhCalculator(null, waterlevelProvider, dischargeProvider, bedHeightsProvider, null, null);
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56
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57 /* access bed soil kind data */
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58 final SoilKindKmValueFinder soilKindFinder = SoilKindKmValueFinder.loadValues(problems, river, calcRange);
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59 if (soilKindFinder == null)
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60 return new TkhCalculator(null, waterlevelProvider, dischargeProvider, bedHeightsProvider, null, null);
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61
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62 final DoubleRange qRange = dischargeProvider.getRange();
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63 final FlowVelocityModelKmValueFinder flowVelocitiesFinder = FlowVelocityModelKmValueFinder.loadValues(problems, river, calcRange, qRange);
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64 if (flowVelocitiesFinder == null)
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65 return new TkhCalculator(null, waterlevelProvider, dischargeProvider, bedHeightsProvider, null, null);
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66
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67 return new TkhCalculator(bedMeasurementsFinder, waterlevelProvider, dischargeProvider, bedHeightsProvider, soilKindFinder,
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68 flowVelocitiesFinder);
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69 }
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70
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71 private TkhCalculator(final BedQualityD50KmValueFinder bedMeasurementsFinder, final WaterlevelValuesFinder waterlevelProvider,
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72 final DischargeValuesFinder dischargeProvider, final BedHeightsFinder bedHeightsProvider, final SoilKindKmValueFinder soilKindFinder,
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73 final FlowVelocityModelKmValueFinder flowVelocitiesFinder) {
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74 this.bedMeasurementsFinder = bedMeasurementsFinder;
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75 this.waterlevelProvider = waterlevelProvider;
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76 this.dischargeProvider = dischargeProvider;
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77 this.bedHeightsProvider = bedHeightsProvider;
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78 this.soilKindFinder = soilKindFinder;
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79 this.flowVelocitiesFinder = flowVelocitiesFinder;
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80 }
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81
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82 public boolean hasTkh() {
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83
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84 if (this.dischargeProvider == null || !this.dischargeProvider.isValid())
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85 return false;
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86
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87 if (this.bedMeasurementsFinder == null)
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88 return false;
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89
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90 if (this.soilKindFinder == null)
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91 return false;
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92
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93 if (this.flowVelocitiesFinder == null)
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94 return false;
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95
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96 return true;
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97 }
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98
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99 private SoilKind getSoilKind(final double km) {
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100
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101 if (this.soilKindFinder == null)
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102 return null;
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103
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104 return this.soilKindFinder.findSoilKind(km);
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105 }
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106
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107 private double getBedMeasurement(final double km) {
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108 return this.bedMeasurementsFinder.findD50(km);
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109 }
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110
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111 public void calculateTkh(final double km, final SInfoResultRow row) {
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112
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113 row.putValue(SInfoResultType.station, km);
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114
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115 final SoilKind kind = getSoilKind(km);
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116 row.putValue(SInfoResultType.soilkind, kind);
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117
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118 final double wst = this.waterlevelProvider.getWaterlevel(km);
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119 row.putValue(SInfoResultType.waterlevel, wst);
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120
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121 final double meanBedHeight = this.bedHeightsProvider.getMeanBedHeight(km);
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122 row.putValue(SInfoResultType.meanBedHeight, meanBedHeight);
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123
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124 final double flowDepth = wst - meanBedHeight;
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125 row.putValue(SInfoResultType.flowdepth, flowDepth);
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126
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127 final double discharge = this.dischargeProvider.getDischarge(km);
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128 row.putValue(SInfoResultType.discharge, discharge);
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129 if (Double.isNaN(discharge))
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130 return;
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131
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132 if (!this.hasTkh())
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133 return;
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134
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135 final double d50 = getBedMeasurement(km);
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136 if (Double.isNaN(d50))
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137 return;
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138 row.putValue(SInfoResultType.d50, d50);
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139
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140 if (!this.flowVelocitiesFinder.findKmQValues(km, discharge))
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141 return;
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142
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143 final double velocity = this.flowVelocitiesFinder.getFindVmainFound();
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144 row.putValue(SInfoResultType.velocity, velocity);
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145
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146 final double tau = this.flowVelocitiesFinder.getFindTauFound();
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147 row.putValue(SInfoResultType.tau, tau);
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148
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149 final double tkh = calculateTkh(wst - meanBedHeight, velocity, d50, tau);
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150 row.putValue(SInfoResultType.tkh, tkh);
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151
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152 switch (kind) {
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153 case starr:
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154 row.putValue(SInfoResultType.tkhup, tkh);
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155 row.putValue(SInfoResultType.tkhdown, 0.0);
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156 break;
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157
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158 case mobil:
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159 default:
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160 row.putValue(SInfoResultType.tkhup, tkh / 2);
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161 row.putValue(SInfoResultType.tkhdown, -tkh / 2);
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162 break;
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163 }
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164
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165 final double flowDepthTkh = calculateFlowDepthTkh(tkh, kind, wst, meanBedHeight);
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166 row.putValue(SInfoResultType.flowdepthtkh, flowDepthTkh);
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167 }
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168
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169 /**
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170 * Calculates a transport body height
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171 *
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172 * @param h
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173 * flow depth in m
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174 * @param vm
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175 * flow velocity in m
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176 * @param d50
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177 * grain diameter D50 in m (!)
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178 * @param tau
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179 * shear stress in N/m^2
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180 * @return transport body height in cm (!), never negative
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181 */
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182 private double calculateTkh(final double h, final double vm, final double d50, final double tau) {
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183 final double PHYS_G = 9.81;
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184 final double PHYS_SPECGRAV_S = 2.6;
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185 final double PHYS_VELOCCOEFF_N = 6;
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186 final double PHYS_FORMCOEFF_ALPHA = 0.7;
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187 final double PHYS_VISCOSITY_NUE = 1.3e-6;
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188 final double PHYS_GRAIN_DENSITY_RHOS = 2603;
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189 final double PHYS_WATER_DENSITY_RHO = 999.97;
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190
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191 final double froude = vm / Math.sqrt(PHYS_G * h);
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192 final double partReynolds = Math.sqrt((PHYS_SPECGRAV_S - 1) * PHYS_G * d50) / PHYS_VISCOSITY_NUE * d50;
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193 final double critShields = 0.22 * Math.pow(partReynolds, -0.6) + 0.06 * Math.pow(10, 7.7 * Math.pow(partReynolds, -0.6));
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194 final double critTau = critShields * (PHYS_GRAIN_DENSITY_RHOS - PHYS_WATER_DENSITY_RHO) * PHYS_G * d50;
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195 final double tkh = 100 * h * (1 - Math.pow(froude, 2)) / (2 * PHYS_VELOCCOEFF_N * PHYS_FORMCOEFF_ALPHA) * (1 - critTau / tau);
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196 // Some regular input values may give a negative calculation result; that is unwanted
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197 if (tkh < 0.0)
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198 return 0.0;
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199
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200 return tkh;
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201 }
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202
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203 private double calculateFlowDepthTkh(final double tkhValue, final SoilKind tkhKind, final double wst, final double meanBedHeight) {
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204
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205 if (Double.isNaN(tkhValue) || tkhKind == null)
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206 return Double.NaN;
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207
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208 switch (tkhKind) {
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209 case starr:
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210 return wst - (meanBedHeight + tkhValue / 100);
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211
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212 case mobil:
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213 default:
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214 return wst - (meanBedHeight + tkhValue / 200);
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215 }
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216 }
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217 }
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