1547 | | [=#<insert_parameter_name> '''<insert_parameter_name>'''] |
1548 | | }}} |
1549 | | {{{#!td style="vertical-align:top" |
1550 | | <insert type> |
1551 | | }}} |
1552 | | {{{#!td style="vertical-align:top" |
1553 | | <insert value> |
1554 | | }}} |
1555 | | {{{#!td |
1556 | | <insert explanation> |
1557 | | }}} |
1558 | | |---------------- |
1559 | | {{{#!td style="vertical-align:top" |
1560 | | [=#<insert_parameter_name> '''<insert_parameter_name>'''] |
1561 | | }}} |
1562 | | {{{#!td style="vertical-align:top" |
1563 | | <insert type> |
1564 | | }}} |
1565 | | {{{#!td style="vertical-align:top" |
1566 | | <insert value> |
1567 | | }}} |
1568 | | {{{#!td |
1569 | | <insert explanation> |
1570 | | }}} |
1571 | | |---------------- |
1572 | | {{{#!td style="vertical-align:top" |
1573 | | [=#<insert_parameter_name> '''<insert_parameter_name>'''] |
1574 | | }}} |
1575 | | {{{#!td style="vertical-align:top" |
1576 | | <insert type> |
1577 | | }}} |
1578 | | {{{#!td style="vertical-align:top" |
1579 | | <insert value> |
1580 | | }}} |
1581 | | {{{#!td |
1582 | | <insert explanation> |
| 1547 | [=#surface_heatflux '''surface_heatflux'''] |
| 1548 | }}} |
| 1549 | {{{#!td style="vertical-align:top" |
| 1550 | R |
| 1551 | }}} |
| 1552 | {{{#!td style="vertical-align:top" |
| 1553 | no prescribed\\ |
| 1554 | heatflux |
| 1555 | }}} |
| 1556 | {{{#!td |
| 1557 | Kinematic sensible heat flux at the bottom surface (in K m/s).\\\\ |
| 1558 | If a value is assigned to this parameter, the internal two-dimensional surface heat flux field '''shf''' is initialized with the value of '''surface_heatflux''' as bottom (horizontally homogeneous) boundary condition for the temperature equation. This additionally requires that a Neumann condition must be used for the potential temperature (see [#bc_pt_b bc_pt_b]), because otherwise the resolved scale may contribute to the surface flux so that a constant value cannot be guaranteed. Also, changes of the surface temperature (see [#pt_surface_initial_change pt_surface_initial_change]) are not allowed. The parameter [#random_heatflux random_heatflux] can be used to impose random perturbations on the (homogeneous) surface heat flux field '''shf'''.\\\\ |
| 1559 | '''Attention:'''\\ |
| 1560 | Setting of '''surface_heatflux''' requires setting of [#use_surface_fluxes use_surface_fluxes] = ''.T.,'' if the Prandtl-layer is switched off ([#prandtl_layer prandtl_layer] = ''.F.'').\\\\ |
| 1561 | In case of a non-flat topography, the internal two-dimensional surface heat flux field '''shf''' is initialized with the value of '''surface_heatflux''' at the bottom surface and [#wall_heatflux wall_heatflux](0) at the topography top face. The parameter random_heatflux can be used to impose random perturbations on this combined surface heat flux field '''shf'''.\\\\ |
| 1562 | If no surface heat flux is assigned, '''shf''' is calculated at each timestep by u,,*,, {{{*}}} theta,,*,, (of course only with [#prandtl_layer prandtl_layer] switched on). Here, u,,*,, and theta,,*,, are calculated from the Prandtl law assuming logarithmic wind and temperature profiles between k=0 and k=1. In this case a Dirichlet condition (see [#bc_pt_b bc_pt_b]) must be used as bottom boundary condition for the potential temperature.\\\\ |
| 1563 | See also [#top_heatflux top_heatflux]. |
| 1564 | }}} |
| 1565 | |---------------- |
| 1566 | {{{#!td style="vertical-align:top" |
| 1567 | [=#surface_scalarflux '''surface_scalarflux'''] |
| 1568 | }}} |
| 1569 | {{{#!td style="vertical-align:top" |
| 1570 | R |
| 1571 | }}} |
| 1572 | {{{#!td style="vertical-align:top" |
| 1573 | 0.0 |
| 1574 | }}} |
| 1575 | {{{#!td |
| 1576 | Scalar flux at the surface (in kg/(m^2^ s)).\\\\ |
| 1577 | If a non-zero value is assigned to this parameter, the respective scalar flux value is used as bottom (horizontally homogeneous) boundary condition for the scalar concentration equation. This additionally requires that a Neumann condition must be used for the scalar concentration (see [#bc_s_b bc_s_b]), because otherwise the resolved scale may contribute to the surface flux so that a constant value cannot be guaranteed. Also, changes of the surface scalar concentration (see [#s_surface_initial_change s_surface_initial_change]) are not allowed.\\\\ |
| 1578 | If no surface scalar flux is assigned ('''surface_scalarflux''' = ''0.0''), it is calculated at each timestep by u,,*,, {{{*}}} s,,*,, (of course only with [#prandtl_layer prandtl_layer] switched on). Here, s,,*,, is calculated from the Prandtl law assuming a logarithmic scalar concentration profile between k=0 and k=1. In this case a Dirichlet condition (see bc_s_b) must be used as bottom boundary condition for the scalar concentration. |
| 1579 | }}} |
| 1580 | |---------------- |
| 1581 | {{{#!td style="vertical-align:top" |
| 1582 | [=#surface_waterflux '''surface_waterflux'''] |
| 1583 | }}} |
| 1584 | {{{#!td style="vertical-align:top" |
| 1585 | R |
| 1586 | }}} |
| 1587 | {{{#!td style="vertical-align:top" |
| 1588 | 0.0 |
| 1589 | }}} |
| 1590 | {{{#!td |
| 1591 | Kinematic water flux near the surface (in m/s).\\\\ |
| 1592 | If a non-zero value is assigned to this parameter, the respective water flux value is used as bottom (horizontally homogeneous) boundary condition for the humidity equation. This additionally requires that a Neumann condition must be used for the specific humidity / total water content (see [#bc_q_b bc_q_b]), because otherwise the resolved scale may contribute to the surface flux so that a constant value cannot be guaranteed. Also, changes of the surface humidity (see [#q_surface_initial_change q_surface_initial_change]) are not allowed.\\\\ |
| 1593 | If no surface water flux is assigned ('''surface_waterflux''' = ''0.0''), it is calculated at each timestep by u,,*,, {{{*}}} q,,*,, (of course only with Prandtl layer switched on). Here, q,,*,, is calculated from the Prandtl law assuming a logarithmic temperature profile between k=0 and k=1. In this case a Dirichlet condition (see bc_q_b) must be used as the bottom boundary condition for the humidity. |
2240 | | [=#<insert_parameter_name> '''<insert_parameter_name>'''] |
2241 | | }}} |
2242 | | {{{#!td style="vertical-align:top" |
2243 | | <insert type> |
2244 | | }}} |
2245 | | {{{#!td style="vertical-align:top" |
2246 | | <insert value> |
2247 | | }}} |
2248 | | {{{#!td |
2249 | | <insert explanation> |
2250 | | }}} |
2251 | | |---------------- |
2252 | | {{{#!td style="vertical-align:top" |
2253 | | [=#<insert_parameter_name> '''<insert_parameter_name>'''] |
2254 | | }}} |
2255 | | {{{#!td style="vertical-align:top" |
2256 | | <insert type> |
2257 | | }}} |
2258 | | {{{#!td style="vertical-align:top" |
2259 | | <insert value> |
2260 | | }}} |
2261 | | {{{#!td |
2262 | | <insert explanation> |
2263 | | }}} |
| 2251 | [=#scalar_exchange_coefficient '''scalar_exchange_coefficient'''] |
| 2252 | }}} |
| 2253 | {{{#!td style="vertical-align:top" |
| 2254 | R |
| 2255 | }}} |
| 2256 | {{{#!td style="vertical-align:top" |
| 2257 | 0.0 |
| 2258 | }}} |
| 2259 | {{{#!td |
| 2260 | Scalar exchange coefficient for a leaf (dimensionless).\\\\ |
| 2261 | This parameter is only of importance in cases in that both, [#plant_canopy plant_canopy] and [#passive_scalar passive_scalar], are set ''.T.''. The value of the scalar exchange coefficient is required for the parametrisation of the sources and sinks of scalar concentration due to the canopy. |
| 2262 | }}} |
| 2263 | |---------------- |