Grid

Exponential vertical grid discretization for pervious and impervious road columns in the urban canopy thermal solver. Computes node depths (Oleson Eq. 4.8), layer thicknesses (Eq. 4.6), and interface depths (Eq. 4.7) with a scaling factor f_s = 0.025 m that produces finer resolution near the surface — a requirement because urban roads overlie real soil and the near-surface diurnal cycle dominates thermal exchange. Migrated from UrbanCanopy.jl@9200edd4 src/roof_wall_road_snow_temperatures.jl:890 (`ExponentialGrid` @component). Implements Oleson et al. (2010, CLM Tech Note Ch. 4 §4.1, Eqs. 4.6-4.8). Parameterized as observed-only: f_s is the only input parameter; z_node_i, dz_layer_i, z_interface_j are algebraic outputs. Upstream `N` (number of layers) is fixed to its canonical default 15 for serialization (per-N templating lives outside the ESM scalar schema and is not needed for the urban-canopy use case).

Uniform vertical grid discretization for roof and wall columns in the urban canopy thermal solver. Computes node depths at layer midpoints (Oleson Eq. 4.5), layer thicknesses (Eq. 4.6), and interface depths (Eq. 4.7) for a column of total thickness `dz_total` divided into N equal-thickness layers. Used for roofs and walls (homogeneous opaque material — concrete, brick, etc.); the road column uses the exponential grid (sibling `exponential_grid.esm`) because it overlies real soil where near-surface diurnal cycles dominate. Migrated from UrbanCanopy.jl@9200edd4 src/roof_wall_road_snow_temperatures.jl:830 (`UniformGrid` @component). Implements Oleson et al. (2010, CLM Tech Note Ch. 4 §4.1, Eqs. 4.5-4.7). Parameterized as observed-only: `dz_total` is the only input parameter; z_node_i, dz_layer_i, z_interface_j are algebraic outputs. Upstream `N` (number of layers) is fixed to its canonical default 15 for serialization (per-N templating lives outside the ESM scalar schema and is not needed for the urban-canopy use case).