{
  "title": "Hampton Clay-Loam Thermal Constants",
  "version": "1.0.0",
  "date_published": "2026-07-17",
  "author": "Cathy Mcmasters",
  "location": {
    "city": "Hampton",
    "state": "Virginia",
    "wikidata": "Q16019",
    "climate_zone": "Humid Subtropical (Cfa)"
  },
  "soil_profile": {
    "type": "Clay-Loam",
    "thermal_conductivity_W_m_K": 1.40,
    "density_kg_m3": 1600,
    "specific_heat_J_kg_K": 2000,
    "derived_diffusivity_mm2_s": 0.4375,
    "moisture_content_assumed": "Field Capacity"
  },
  "climatic_parameters": {
    "annual_temp_range_Celsius": 28.0,
    "summer_peak_avg_Celsius": 29.5,
    "winter_trough_avg_Celsius": 1.5,
    "cycle_period_seconds": 31557600,
    "source": "NOAA NCEI 1991-2020 Normals"
  },
  "computation_method": {
    "equation": "Fourier 1D Periodic Diffusion",
    "amplitude_decay_formula": "A(z) = A_0 * exp(-z * sqrt(pi*omega/k))",
    "safety_threshold_default_Celsius": 2.0,
    "reference": "ASTM C518 Standard Test Method"
  }
}