Merge pull request #325 from Deltares/kvfrac_leakage

Kvfrac leakage

docs/src/changelog.md

@@ -20,6 +20,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   outflow variables are defined for period `Δt`, and not at `t1` and `t2` (instantaneous) as
   in the original mass balance equation of the Modified Puls Approach. Because of this, the
   terms of the quadratic equation (and solution) were fixed.
+- Use `kvfrac` for the computation of vertical saturated hydraulic conductivity at the
+  bottom of the soil layer, since `kvfrac` is also used for the computation of vertical
+  unsaturated flow. 
 
 ### Changed
 - For cyclic parameters different cyclic time inputs are supported (only one common cyclic

docs/src/model_docs/params_lateral.md

@@ -191,7 +191,7 @@ scales (hillslope) in reality, not represented by the model resolution.
 | `dw` | drain width | m | - |
 | `zi` | pseudo-water table depth (top of the saturated zone) | m | - |
 | `exfiltwater` | exfiltration (groundwater above surface level, saturated excess conditions) | m Δt⁻¹ | - |
-| `recharge` | net recharge to saturated store  | m Δt⁻¹ | - |
+| `recharge` | net recharge to saturated store  | m``^2`` Δt⁻¹ | - |
 | `ssf` | subsurface flow  | m``^3`` d``{-1}``  | - |
 | `ssfin` | inflow from upstream cells | m``^3`` d``{-1}``  | - |
 | `ssfmax` | maximum subsurface flow | m``^2`` d``{-1}``  | - |

src/flow.jl

@@ -398,7 +398,7 @@ end
     dw::Vector{T} | "m"                    # Flow width [m]
     zi::Vector{T} | "m"                    # Pseudo-water table depth [m] (top of the saturated zone)
     exfiltwater::Vector{T} | "m Δt-1"      # Exfiltration [m Δt⁻¹] (groundwater above surface level, saturated excess conditions)
-    recharge::Vector{T} | "m Δt-1"         # Net recharge to saturated store [m Δt⁻¹]
+    recharge::Vector{T} | "m2 Δt-1"        # Net recharge to saturated store [m² Δt⁻¹]
     ssf::Vector{T} | "m3 d-1"              # Subsurface flow [m³ d⁻¹]
     ssfin::Vector{T} | "m3 d-1"            # Inflow from upstream cells [m³ d⁻¹]
     ssfmax::Vector{T} | "m2 d-1"           # Maximum subsurface flow [m² d⁻¹]

src/sbm.jl

@@ -925,7 +925,7 @@ function update_until_recharge(sbm::SBM, config)
                 actcapflux = actcapflux + toadd
             end
         end
-        deepksat = sbm.kv₀[i] * exp(-sbm.f[i] * sbm.soilthickness[i])
+        deepksat = sbm.kvfrac[i][end] * sbm.kv₀[i] * exp(-sbm.f[i] * sbm.soilthickness[i])
         deeptransfer = min(satwaterdepth, deepksat)
         actleakage = max(0.0, min(sbm.maxleakage[i], deeptransfer))