landuseClass.C

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#include "landuseClass.H"
 
 
namespace Foam
{
 
  landuseClass::~landuseClass()
  {
  }
  
  landuseClass::landuseClass() {
  
    code_ = -1;
    name_ = word("default");
    Cd_=0;
    LAI_=0;
    z0_=0;
    height_=0;
    LADmax_=0;
  }
 
 
  landuseClass::landuseClass(const dictionary& dict, word name) {
  
    dictionary landuseClassDict(dict.subDict(name));
 
    landuseClassDict.lookup("code") >> code_;
 
    name_ = name;
     
    Cd_ = landuseClassDict.lookupOrDefault("Cd", 0.2, false, false);
    height_ = landuseClassDict.lookupOrDefault("height", 0.0, false, false);
    z0_ = landuseClassDict.lookupOrDefault("z0", 0.001, false, false);
    LAI_ = landuseClassDict.lookupOrDefault("LAI", 0.0, false, false);
    LADmax_ = landuseClassDict.lookupOrDefault("LADmax", -1.0, false, false);
    
    if (landuseClassDict.found("LADProfile"))
      landuseClassDict.lookup("LADProfile", false, false) >> LADProfile_;
    
    if (LADmax_ == -1.0) {
      LADmaxFromLAI();
    }
  }
 
  scalar Foam::landuseClass::integrateLAD()
  {
    //uses simpsons rule to integrate between the points
    scalar LAItmp=0;
    for(label fi=1;fi<LADProfile_.size();fi++)
    {
        if(LADProfile_[fi]==0 or LADProfile_[fi-1]==0)
      LAItmp += 1/2.0*abs(LADProfile_[1]-LADProfile_[0])*LADmax_*0.1*height_;
        else
      LAItmp += min(LADProfile_[fi],LADProfile_[fi-1])*LADmax_*0.1*height_
        +1/2.0*abs(LADProfile_[fi]-LADProfile_[fi-1])*0.1*height_;
    }
    return LAItmp;
  }
 
  void landuseClass::LADmaxFromLAI()
  {
    LADmax_ = 0;
    scalar LAItmp = 0;
    while(LAItmp < LAI_)
      {
        LAItmp = Foam::landuseClass::integrateLAD();
        LADmax_ += 0.01;
      }
  }
 
 
  scalar landuseClass::LAD(scalar z, scalar treeHeight=-1) 
  {
    
    // If tree height is not specified, the value of the landuse class is used
    if (treeHeight == -1)
      treeHeight = height_;
    
    if (treeHeight <= 0)
      return 0;
    
    if (z > treeHeight)
      return 0;
    
    // calculate vertical distance represented by each value in LADProfile
    scalar deltaz = treeHeight / scalar(LADProfile_.size());
    
    // Calculate which index in the LADProfile that should be used at height z
    label profileIndex = label(round(z / deltaz));
 
    // find index in LADProfile with max LAD
    label LADMaxIndex = 0;
    scalar tmpLAD = -1;
    for(label i=0; i < LADProfile_.size(); i++)
    {
        if (LADProfile_[i] > tmpLAD)
        {
            LADMaxIndex = i;
            tmpLAD = LADProfile_[LADMaxIndex];
        }
    }
  
    // return LAD at height z
    return LADProfile_[profileIndex] / LADProfile_[LADMaxIndex] * LADmax_;
  }
}