Breach model (Water Overlay) - Revision history

Rudolf@tygron.nl: /* Breach width growth */

2023-01-26T14:36:53Z

Breach width growth

Rudolf@tygron.nl at 14:32, 26 January 2023

2023-01-26T14:32:54Z

← Older revision		Revision as of 14:32, 26 January 2023
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	===Breach placement===		===Breach placement===
	A breach is defined using an [[Area]] that has the [[key]] [[Breach height (Water Overlay)\|BREACH_HEIGHT]] set. Its base are is defined by the geometry of the breach area. The breach is also given a starting [[width]]. Optionally it can also be given an [[Breach angle (Water Overlay)\|angle]], which is used in the flow formula and in placing the downstream level measurement point.		A breach is defined using an [[Area]] that has the [[key]] [[Breach height (Water Overlay)\|BREACH_HEIGHT]] set. Its base are is defined by the geometry of the breach area. The breach is also given a starting [[breach width (Water Overlay)\|width]]. Optionally it can also be given an [[Breach angle (Water Overlay)\|angle]], which is used in the flow formula and in placing the downstream level measurement point.

	The images below show two different setups. Note that the configuration of input and level measuring can also be done in a different combination, not only the two shown below.		The images below show two different setups. Note that the configuration of input and level measuring can also be done in a different combination, not only the two shown below.

Frank@tygron.nl: /* Breach flow direction */

2023-01-18T16:47:31Z

Breach flow direction

← Older revision		Revision as of 16:47, 18 January 2023
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	<gallery widths=500px heights=300px>		<gallery widths=500px heights=300px>
	File:breach-active.png\|[[Flooding Overlay]] [[Base types result type (Water Overlay)\|base type result]] showing the active an inactive part of the breach.		File:breach-active.png\|[[Flooding Overlay]] [[Base types result type (Water Overlay)\|base type result]] showing the active an inactive part of the breach.
	File:breach-direction.png\|[[Flooding Overlay]] [[~~Avg direction result type~~ (~~Water Overlay~~)\|direction result]] showing the direction on the active and surrounding area around the breach.		File:breach-direction.png\|[[Flooding Overlay]] [[Surface_last_direction_result_type_(Water_Overlay)\|surface direction result]] showing the direction on the active and surrounding area around the breach.
	</gallery>		</gallery>

Frank@tygron.nl: /* Breach flow direction */

2023-01-18T16:46:25Z

Breach flow direction

← Older revision		Revision as of 16:46, 18 January 2023
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	<gallery widths=500px heights=300px>		<gallery widths=500px heights=300px>
	File:breach-active.png\|[[Flooding Overlay]] [[Base type ~~result~~ (Water Overlay)\|base type result]] showing the active an inactive part of the breach.		File:breach-active.png\|[[Flooding Overlay]] [[Base types result type (Water Overlay)\|base type result]] showing the active an inactive part of the breach.
	File:breach-direction.png\|[[Flooding Overlay]] [[Avg direction result (Water Overlay)\|direction result]] showing the direction on the active and surrounding area around the breach.		File:breach-direction.png\|[[Flooding Overlay]] [[Avg direction result type (Water Overlay)\|direction result]] showing the direction on the active and surrounding area around the breach.
	</gallery>		</gallery>

Frank@tygron.nl: /* Breach flow direction */

2023-01-18T16:45:31Z

Breach flow direction

← Older revision		Revision as of 16:45, 18 January 2023
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	File:breach-direction.png\|[[Flooding Overlay]] [[Avg direction result (Water Overlay)\|direction result]] showing the direction on the active and surrounding area around the breach.		File:breach-direction.png\|[[Flooding Overlay]] [[Avg direction result (Water Overlay)\|direction result]] showing the direction on the active and surrounding area around the breach.
	</gallery>		</gallery>

	==Breach width growth==		==Breach width growth==
	* The breach can grow over time, based on its initial [[Breach_width_(Water_Overlay)\|width]], [[Breach_speed_(Water_Overlay)\|critical speed]] and inner and outer water level, for more details see [[Breach_growth_formula_(Water_Overlay)\|Verheij–van der Knaap growth formula]].		* The breach can grow over time, based on its initial [[Breach_width_(Water_Overlay)\|width]], [[Breach_speed_(Water_Overlay)\|critical speed]] and inner and outer water level, for more details see [[Breach_growth_formula_(Water_Overlay)\|Verheij–van der Knaap growth formula]].

Frank@tygron.nl at 16:43, 18 January 2023

2023-01-18T16:43:00Z

← Older revision		Revision as of 16:43, 18 January 2023
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	Water flowing through the breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. When no [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] is defined, water can flow in any direction. Adding this attribute with also convert the breach advection speed (m/s) into the 2D cell of the breach area. It is recommended to always use this attribute for optimal flow.		Water flowing through the breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. When no [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] is defined, water can flow in any direction. Adding this attribute with also convert the breach advection speed (m/s) into the 2D cell of the breach area. It is recommended to always use this attribute for optimal flow.

			<gallery widths=500px heights=300px>
			File:breach-active.png\|[[Flooding Overlay]] [[Base type result (Water Overlay)\|base type result]] showing the active an inactive part of the breach.
			File:breach-direction.png\|[[Flooding Overlay]] [[Avg direction result (Water Overlay)\|direction result]] showing the direction on the active and surrounding area around the breach.
			</gallery>
	==Breach width growth==		==Breach width growth==
	* The breach can grow over time, based on its initial [[Breach_width_(Water_Overlay)\|width]], [[Breach_speed_(Water_Overlay)\|critical speed]] and inner and outer water level, for more details see [[Breach_growth_formula_(Water_Overlay)\|Verheij–van der Knaap growth formula]].		* The breach can grow over time, based on its initial [[Breach_width_(Water_Overlay)\|width]], [[Breach_speed_(Water_Overlay)\|critical speed]] and inner and outer water level, for more details see [[Breach_growth_formula_(Water_Overlay)\|Verheij–van der Knaap growth formula]].

Frank@tygron.nl: /* Input Area */

2023-01-18T16:16:08Z

Input Area

← Older revision		Revision as of 16:16, 18 January 2023
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	===Input Area===		===Input Area===
	When you want to simulate a breach with a body of water situated within your project bounds, you can also use [[Breach input area (Water Overlay)\|input area]]. An input area is expected to be situated in a [[Water area ]]. Input areas are not allowed to overlap. However, they are allowed to be situated within the same [[Water area (Water Overlay)\|~~water area~~]].		When you want to simulate a breach with a body of water situated within your project bounds, you can also use [[Breach input area (Water Overlay)\|input area]]. An input area is expected to be situated in a [[Water area (Water Overlay)\|Water Area]]. Input areas are not allowed to overlap. However, they are allowed to be situated within the same [[Water area (Water Overlay)\|Water Area]].

	Each Breach simulation step the water level will be determined for the input are and the breach area and used to calculate the flow. The calculated amount is then removed from the input area and the water levels are recalculated for the input area. During the water simulation steps, water can flow into the input area according to the [[Surface model (Water Overlay)\|surface water model calculations]].		Each Breach simulation step the water level will be determined for the input are and the breach area and used to calculate the flow. The calculated amount is then removed from the input area and the water levels are recalculated for the input area. During the water simulation steps, water can flow into the input area according to the [[Surface model (Water Overlay)\|surface water model calculations]].

Frank@tygron.nl at 16:15, 18 January 2023

2023-01-18T16:15:26Z

← Older revision		Revision as of 16:15, 18 January 2023
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	When you want to simulate a breach with a body of water situated within your project bounds, you can also use [[Breach input area (Water Overlay)\|input area]]. An input area is expected to be situated in a [[Water area ]]. Input areas are not allowed to overlap. However, they are allowed to be situated within the same [[Water area (Water Overlay)\|water area]].		When you want to simulate a breach with a body of water situated within your project bounds, you can also use [[Breach input area (Water Overlay)\|input area]]. An input area is expected to be situated in a [[Water area ]]. Input areas are not allowed to overlap. However, they are allowed to be situated within the same [[Water area (Water Overlay)\|water area]].

	Each Breach simulation step the water level will be determined for the input are and the breach area and used to calculate the flow. The calculated amount is then removed from the input area and the water levels are recalculated for the input area. During the water simulation steps, water can flow into the input area according to the [[Surface model (Water ~~Module~~)\|surface water model calculations]].		Each Breach simulation step the water level will be determined for the input are and the breach area and used to calculate the flow. The calculated amount is then removed from the input area and the water levels are recalculated for the input area. During the water simulation steps, water can flow into the input area according to the [[Surface model (Water Overlay)\|surface water model calculations]].

	==Breach flow==		==Breach flow==

Frank@tygron.nl: /* Breach flow direction */

2023-01-18T16:14:06Z

Breach flow direction

← Older revision		Revision as of 16:14, 18 January 2023
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	==Breach flow direction==		==Breach flow direction==
	Water flowing through the breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. When no [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] is defined, water can flow in any direction. Adding this attribute with also convert the breach advection speed (m/s) into the 2D cell of the breach area. It is recommended to always use this attribute for optimal flow.		Water flowing through the breach will flow in the direction defined by the [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] attribute, regardless of whether the water flowed onto the breach from elsewhere in the water model, or from the simulated external water body. When no [[Breach_angle_(Water_Overlay)\|BREACH_ANGLE]] is defined, water can flow in any direction. Adding this attribute with also convert the breach advection speed (m/s) into the 2D cell of the breach area. It is recommended to always use this attribute for optimal flow.


	==Breach width growth==		==Breach width growth==

Frank@tygron.nl: /* Breach width growth */

2023-01-18T16:13:59Z

Breach width growth

← Older revision		Revision as of 16:13, 18 January 2023
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	* Instead of using an input area you can also define a fictitious external area, this can represent a larger water body outside the project area, e.g. a part of a sea. The external area also has it's own [[External_surface_level_(Water_Overlay)\|Surface level]], [[External_water_level_(Water_Overlay)\|Water level]] and [[External_area_(Water_Overlay)\|Area]].		* Instead of using an input area you can also define a fictitious external area, this can represent a larger water body outside the project area, e.g. a part of a sea. The external area also has it's own [[External_surface_level_(Water_Overlay)\|Surface level]], [[External_water_level_(Water_Overlay)\|Water level]] and [[External_area_(Water_Overlay)\|Area]].
	* If no [[Breach_speed_(Water_Overlay)\|BREACH_SPEED]] attribute is defined, the active breach will never grow.		* If no [[Breach_speed_(Water_Overlay)\|BREACH_SPEED]] attribute is defined, the active breach will never grow.




	{{article end		{{article end

← Older revision		Revision as of 14:36, 26 January 2023
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	==Breach width growth==		==Breach width growth==
	* The breach can grow over time, based on its initial [[~~Breach_width_~~(~~Water_Overlay~~)\|width]], [[~~Breach_speed_~~(~~Water_Overlay~~)\|critical speed]] and inner and outer water level, for more details see [[~~Breach_growth_formula_~~(~~Water_Overlay~~)\|Verheij–van der Knaap growth formula]].		* The breach can grow over time, based on its initial [[Breach width (Water Overlay)\|width]], [[Breach speed (Water Overlay)\|critical speed]] and inner and outer water level, for more details see [[Breach growth formula (Water Overlay)\|Verheij–van der Knaap growth formula]].
	* If a [[~~Breach_width_~~(~~Water_Overlay~~)\|BREACH_WIDTH]] attribute is defined, the breach's polygon is intersected with a circle emanating from the center-point of the polygon. It is only in that intersection, called "active", that water will flow in from the input area. The radius of the circle defining the intersection will expand as the breach grows over time.		* If a [[Breach width (Water Overlay)\|BREACH_WIDTH]] attribute is defined, the breach's polygon is intersected with a circle emanating from the center-point of the polygon. It is only in that intersection, called "active", that water will flow in from the input area. The radius of the circle defining the intersection will expand as the breach grows over time.
	* If no width is defined, the width is assumed to be very large, using the full Breach area polygon.		* If no width is defined, the width is assumed to be very large, using the full Breach area polygon.
	* With larger breaches the water level inside the breach area can become turbulent. Therefor the inner water level (used for breach growth) is measured at a distance defined in [[~~Breach_measurement_distance_m_~~(~~Water_Overlay~~)\|BREACH_MEASUREMENT_DISTANCE_M]] behind the breach area when an [[~~Breach_angle_~~(~~Water_Overlay~~)\|BREACH_ANGLE]] is provided.		* With larger breaches the water level inside the breach area can become turbulent. Therefor the inner water level (used for breach growth) is measured at a distance defined in [[Breach measurement distance m (Water Overlay)\|BREACH_MEASUREMENT_DISTANCE_M]] behind the breach area when an [[Breach angle (Water Overlay)\|BREACH_ANGLE]] is provided.
	* Instead of using an input area you can also define a fictitious external area, this can represent a larger water body outside the project area, e.g. a part of a sea. The external area also has it's own [[~~External_surface_level_~~(~~Water_Overlay~~)\|Surface level]], [[~~External_water_level_~~(~~Water_Overlay~~)\|Water level]] and [[~~External_area_~~(~~Water_Overlay~~)\|Area]].		* Instead of using an input area you can also define a fictitious external area, this can represent a larger water body outside the project area, e.g. a part of a sea. The external area also has it's own [[External surface level (Water Overlay)\|Surface level]], [[External water level (Water Overlay)\|Water level]] and [[External area (Water Overlay)\|Area]].
	* If no [[~~Breach_speed_~~(~~Water_Overlay~~)\|BREACH_SPEED]] attribute is defined, the active breach will never grow.		* If no [[Breach speed (Water Overlay)\|BREACH_SPEED]] attribute is defined, the active breach will never grow.

	{{article end		{{article end
	\|notes=		\|notes=
	* The elevation model covered by the entire breach area is lowered to at least the minimum height defined by its [[~~Breach_height_~~(~~Water_Overlay~~)\|~~BREACH_HEIGHT~~]] attribute. This is to prevent the terrain height from interfering with the flow.		* The elevation model covered by the entire breach area is lowered to at least the minimum height defined by its [[Breach height (Water Overlay)\|BREACH HEIGHT]] attribute. This is to prevent the terrain height from interfering with the flow.
	* When using breach growth the inner water level is computed from the average value in the active breach area. For optimal flow simulation it is therefor recommended to place the breach area just behind the levee on a flat space.		* When using breach growth the inner water level is computed from the average value in the active breach area. For optimal flow simulation it is therefor recommended to place the breach area just behind the levee on a flat space.
	* Water on a breach area is automatically spread across the entire active breach area equally.		* Water on a breach area is automatically spread across the entire active breach area equally.
	* The inner/outer water levels and breach width are visualized per timeframe on the breach object in the 3D map, these can be very useful to see how the breach is progressing.		* The inner/outer water levels and breach width are visualized per timeframe on the breach object in the 3D map, these can be very useful to see how the breach is progressing.
	* The [[~~Base_types_result_type_~~(~~Water_Overlay~~)\|Base Types Result]] child overlay can be used to see which part of entire the breach area is considered "active". Breach growth can be seen when checking multiple timeframes.		* The [[Base types result type (Water Overlay)\|Base Types Result]] child overlay can be used to see which part of entire the breach area is considered "active". Breach growth can be seen when checking multiple timeframes.
	* You can also optionally change the default breach weir coefficient to model energy loss by adding a [[~~Weir_coefficient_~~(~~Water_Overlay~~)\|WEIR_COEFFICIENT]] attribute to the Breach area.		* You can also optionally change the default breach weir coefficient to model energy loss by adding a [[Weir coefficient (Water Overlay)\|WEIR_COEFFICIENT]] attribute to the Breach area.
	* When the water level of in the input area drops over time the flow can also reverse, flowing back into the e.g. the river/sea.		* When the water level of in the input area drops over time the flow can also reverse, flowing back into the e.g. the river/sea.
	\|seealso=		\|seealso=
	*[[Breach (Water Overlay)]]		* [[Breach (Water Overlay)]]
	*[[Breach flow formula (Water Overlay)]]		* [[Breach flow formula (Water Overlay)]]
	*[[Breach growth formula (Water Overlay)]]		* [[Breach growth formula (Water Overlay)]]
	}}		}}

	{{WaterOverlay formula nav}}		{{WaterOverlay formula nav}}