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The introduction of CaMa-Flood in the IFS permit to consider a tighter coupling between the inundated areas and the atmosphere, as well as the soil below. A set experiments has been prepare to support the development of the 2-way coupling, starting from re-evaporating from temporarily inundated areas. CAMA-Coupling of lakes and inundation require alignment with the Hydro branches. Here work in progress experiments:
| N | Type | Experiment | Resolution | Time | Branch | Label | Comments |
|---|---|---|---|---|---|---|---|
| 1 | Surface | ivkr | TCo399 | 1980-2025 | pad_CY49R1_control_50R1_esuite | CONTROL | 4 Layers as in 49r1 Oper. |
| 2 | Surface | ivk9 | TCo399 | 1980-2025 | pad_CY49R1_control_50R1_esuite | CAMA2WAY | CAMA-Flood is coupled 2way with impact on Evaporation |
| 3 | Surface | iw03 | TCo399 | 1980-2025 | pad_CY49R1_control_50R1_esuite | CAMA2WAY | CAMA-Flood is coupled 2way with impact on Evaporation, and with water extracted from rivers (LWEVAP=.true.) |
To assess the feasibility of the lake model to handle shallow inundated areas control experiment has been prepared and sensitivity runs with changing lake depths were submitted. Lake experts recommended the minimum lake depth to be safely be lowered from the current 2m to 0.5m (with tests done down to 0.1m).
flakerad_mod.F90:ZDEPTH_W_MAX = 50.0_JPRD ! Maximum lake depth simulated by FLAKE
flakerad_mod.F90:ZDEPTH_W_MIN = 2.0_JPRD ! Minimum lake depth simulated by FLAKE
Flake can therefore be adapted to represent the thermodynamics exchanges for inundated and irrigated areas. Two new branches are created (git main ifsbranch -J -B central/CY49R1.1 -b control).
| N | Type | Experiment | Resolution | Time | Branch | Label | Comments |
|---|---|---|---|---|---|---|---|
| 1 | Surface | iv3q (copy of iluo) | TCo399 | 1980-2024 | pad_CY49R1.1_control | CONTROL | 4 Layers as in 49r1 Oper. Minimum lake depth 2.0m |
| 2 | Surface | iv6b | TCo399 | 1980-2024 | pad_CY49R1.1_shallow_water | SHALLOW WATER | Minimum lake depth 0.5m |
| 3 | Surface | iv74 | TCo399 | 1980-2024 | pad_CY49R1.1_shallow_water_1 | SHALLOW WATER | Minimum lake depth 1.0m |
| 4 | Surface | iv8v | TCo399 | 1980-2024 | pad_CY49R1.1_shallow_water_15 | SHALLOW WATER | Minimum lake depth 1.5m |
Results file:///perm/pad/climsfc/49r1_shallow_lakes/plots/eval_mon.html indicate neutral impact from changing the minimum lake depth.
Lake mean depth correction/upgrade details the recently updated lake depth (i.e. new bathymetry for Caspian Sea, Azov Sea, Titicaca Lake, how we recognize lakes to map mean depth.
Experience with Time-varying lakes can help handle inundation and water recess. Time-varying lakes: offline model changes (+ experiments 1992-2019) are a useful set of experiments.
The Coupling feasibility (D4) of CAMA-Flood to IFS had already identified 2 possibilities. These were considered in the discussion Towards 2-way coupling of CaMa-Flood and ECland in preparation to the LCS25.
A set of case studies is identified and the plan is to compare with the operational runs and the Atos DestinE Extremes DT run. The control TEST: Run ecLand/CaMa-Flood with SDFOR instead of SDOR can provide the starting point from both 9 and 4km coupled testing. Offline DestinE new experiments are also providing a useful batch.
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