Landuse.hpp

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#ifndef OPENSWMM_LANDUSE_HPP
#define OPENSWMM_LANDUSE_HPP
 
#include <vector>
 
namespace openswmm {
 
struct SimulationContext;
 
namespace landuse {
 
// ============================================================================
// Buildup/washoff function types
// ============================================================================
 
enum class BuildupType : int {
    NONE     = 0,
    POWER    = 1,
    EXPON    = 2,
    SATUR    = 3,
    EXTERNAL = 4
};
 
enum class WashoffType : int {
    NONE    = 0,
    EXPON   = 1,
    RATING  = 2,
    EMC     = 3
};
 
// ============================================================================
// Per (landuse × pollutant) buildup/washoff parameters — SoA
// ============================================================================
 
struct BuildupParams {
    BuildupType type = BuildupType::NONE;
    double coeff[3] = {};     
    double max_days = 0.0;    
    int    normalizer = 0;    
};
 
struct WashoffParams {
    WashoffType type = WashoffType::NONE;
    double coeff = 0.0;       
    double expon = 0.0;       
    double sweep_effic = 0.0; 
    double bmp_effic = 0.0;   
};
 
// ============================================================================
// Surface quality SoA (per subcatchment × pollutant)
// ============================================================================
 
struct SurfaceQualitySoA {
    int n_subcatch = 0;
    int n_landuses = 0;
    int n_pollutants = 0;
 
    std::vector<double> buildup;
 
    std::vector<double> washoff_conc;
 
    std::size_t bu_idx(int sc, int lu, int p) const {
        return static_cast<std::size_t>(sc) * static_cast<std::size_t>(n_landuses * n_pollutants)
             + static_cast<std::size_t>(lu) * static_cast<std::size_t>(n_pollutants)
             + static_cast<std::size_t>(p);
    }
 
    void resize(int n_sc, int n_lu, int n_poll);
};
 
// ============================================================================
// Landuse quality solver
// ============================================================================
 
class LanduseSolver {
public:
    void init(int n_landuses, int n_pollutants);
 
    void computeBuildup(SurfaceQualitySoA& sq,
                        const double* area, const double* curb_length,
                        double dt, int n_subcatch);
 
    void computeWashoff(SurfaceQualitySoA& sq,
                        const double* runoff, const double* area,
                        int n_subcatch);
 
    std::vector<BuildupParams> buildup_params;
    std::vector<WashoffParams> washoff_params;
    int n_landuses_ = 0;
    int n_pollutants_ = 0;
};
 
} // namespace landuse
} // namespace openswmm
 
#endif // OPENSWMM_LANDUSE_HPP