UK EA benchmark 2 (Water Module) - Revision history

Frank@tygron.nl at 12:07, 7 July 2026

2026-07-07T12:07:37Z

← Older revision		Revision as of 12:07, 7 July 2026
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	===Notes===		===Notes===
	* Tests ~~were run with~~ a multi-GPU setup~~. For small cases like this~~, ~~using~~ single ~~GPU actually leads to~~ faster ~~results~~. ~~Furthermore, requesting a high number of~~ 576 timeframes ~~further bogs it down. In comparison: 1~~ GPU with ~~1 resulting~~ timeframe ~~runs in: 8 s~~, ~~which is +-~~ 53% faster ~~compared to 2~~ GPUs with 576 timeframes.		* Tests used a multi-GPU setup, though single GPUs are faster for small cases. Requesting 576 timeframes reduces performance; one GPU with one timeframe takes 8s, roughly 53% faster than two GPUs with 576 timeframes.

	==Public test project==		==Public test project==
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	\| -290		\| -290
	\|}		\|}
	~~Note that the~~ coordinate system ~~in this project~~ differs from the ~~one used during the actual~~ benchmark testing ~~as shown~~ in Fig. (b). ~~For the above listed points the~~ center (0,0) is ~~located~~ at the top-left ~~corner instead of~~ the bottom-left, ~~hence will~~ the bottom-right corner ~~will have coordinates~~ (2,000;-2,000).		The coordinate system differs from the benchmark testing in Fig. (b). The center (0,0) is at the top-left rather than the bottom-left; therefore, the bottom-right corner is (2,000;-2,000).

	===Water level relative to datum===		===Water level relative to datum===
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	{{article end		{{article end
	\|notes=		\|notes=
	* ~~These output~~ values may deviate ~~slightly~~ from ~~those of the~~ initial testing ~~phase (i.e. not the public test project), since there is a substantial time gap between when the two projects were set up, during which several changes have been made~~ to ~~the~~ engine ~~of the {{software}}~~.		* Output values may deviate from initial testing due to software engine updates occurring between project setups.
	\| references=		\| references=
	<references>		<references>

Frank@tygron.nl at 09:14, 6 July 2026

2026-07-06T09:14:05Z

← Older revision		Revision as of 09:14, 6 July 2026
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	The area modelled, shown in Fig. (a), is a perfect 2,000 m x 2,000 m square and consists of a 4 x 4 matrix of ~0.5-m deep depressions with smooth topographic transitions. The DEM (digital elevation model) was obtained by multiplying sinusoids in the north to south and west to east directions, and the resulting depressions are all identical in shape. An underlying average slope of 1:1,500 exists in the north to south direction, and of 1:3,000 in the west to east direction, with a ~2-m drop in elevation along the north-west to south-east diagonal.{{ref\|Néelz}}		The area modelled, shown in Fig. (a), is a perfect 2,000 m x 2,000 m square and consists of a 4 x 4 matrix of ~0.5-m deep depressions with smooth topographic transitions. The DEM (digital elevation model) was obtained by multiplying sinusoids in the north to south and west to east directions, and the resulting depressions are all identical in shape. An underlying average slope of 1:1,500 exists in the north to south direction, and of 1:3,000 in the west to east direction, with a ~2-m drop in elevation along the north-west to south-east diagonal.{{ref\|Néelz}}

	The inflow boundary condition was applied along a 100-m line running south from the northwestern corner of the modelled domain, indicated by a red line in Fig. (a). A flooding with a peak flow of 20 m<sup>3</sup>/s and time base of ~85 minutes was implemented according the hydrograph in Fig. (b). The model was run for 2 days (48 hours) to allow the inundation to settle to its final state.{{ref\|Néelz}}		The inflow boundary condition was applied along a 100-m line running south from the northwestern corner of the modelled domain, indicated by a red line in Fig. (a). A flooding with a peak flow of 20 m<sup>3</sup>/s and time base of ~85 minutes was implemented according to the hydrograph in Fig. (b). The model was run for 2 days (48 hours) to allow the inundation to settle to its final state.{{ref\|Néelz}}

	[[File:flood_hydrograph_case2_ukbm.png\|left\|thumb\|x200px\|Fig. (b): Inflow hydrograph, which functioned as upstream boundary condition]]		[[File:flood_hydrograph_case2_ukbm.png\|left\|thumb\|x200px\|Fig. (b): Inflow hydrograph, which functioned as upstream boundary condition]]
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	* Numerical scheme: [[Surface flow formula (Water Overlay)\|FV (Kurganov, Bollerman, Horvath)]]		* Numerical scheme: [[Surface flow formula (Water Overlay)\|FV (Kurganov, Bollerman, Horvath)]]
	* Object flow (m<sup>3</sup>/s): 96,985.64		* Object flow (m<sup>3</sup>/s): 96,985.64
	* Remaining volume water (m<sup>3</sup>/s): 96,982.30		* Remaining volume water (m<sup>3</sup>): 96,982.30

	===Test results===		===Test results===
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	\| -290		\| -290
	\|}		\|}
	Note that the coordinate system in this project differs from the one used during the actual benchmark testing as shown in Fig. (b). For the above listed points the center (0,0) is located at the top-left corner instead of the bottom-left, hence will the bottom-right corner have coordinates (2,000;-2,000).		Note that the coordinate system in this project differs from the one used during the actual benchmark testing as shown in Fig. (b). For the above listed points the center (0,0) is located at the top-left corner instead of the bottom-left, hence will the bottom-right corner will have coordinates (2,000;-2,000).

	===Water level relative to datum===		===Water level relative to datum===

Frank@tygron.nl: /* Public test project */

2026-07-06T09:13:17Z

Public test project

← Older revision		Revision as of 09:13, 6 July 2026
Line 128:		Line 128:

	==Public test project==		==Public test project==
	A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[New Project Wizard]] and require configuration through the [[API]].		A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[New Project Wizard]] and require configuration through the [[REST API]].

	===Measurement points===		===Measurement points===

Maxim@tygron.com: /* Technical setup */

2026-03-06T14:29:11Z

Technical setup

← Older revision		Revision as of 14:29, 6 March 2026
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	==Technical setup==		==Technical setup==
	The required DEM is provided as an ASCII file (test2DEM.asc). As its cell size is 2 m, whereas the test is expected to be run on a 20-m grid, it will be automatically rescaled by the [[Rasterization ~~model~~]]. The dimensions of the test area must be 2,000 by 2,000 m. The original DEM had an offset of -200 m, which was cropped down to -20 m (= 1 grid cell) so it could function as border cell. The rescaled and cropped ASCII file will shortly be provided as part of a .zip found at the bottom of this page.		The required DEM is provided as an ASCII file (test2DEM.asc). As its cell size is 2 m, whereas the test is expected to be run on a 20-m grid, it will be automatically rescaled by the [[Rasterization]] process. The dimensions of the test area must be 2,000 by 2,000 m. The original DEM had an offset of -200 m, which was cropped down to -20 m (= 1 grid cell) so it could function as border cell. The rescaled and cropped ASCII file will shortly be provided as part of a .zip found at the bottom of this page.
	<ul>		<ul>
	<li style="display:inline-block">[[File:hmapori_case2_ukbm.png\|thumb\|x353px\|Original 2-m heightmap (2,400 m x 2,400 m)]]</li>		<li style="display:inline-block">[[File:hmapori_case2_ukbm.png\|thumb\|x353px\|Original 2-m heightmap (2,400 m x 2,400 m)]]</li>

Maxim@tygron.com: /* Technical setup */

2026-03-06T14:26:27Z

Technical setup

← Older revision		Revision as of 14:26, 6 March 2026
Line 28:		Line 28:

	==Technical setup==		==Technical setup==
	The required DEM is provided as an ASCII file (test2DEM.asc). As its cell size is 2 m, whereas the test is expected to be run on a 20-m grid, it will be automatically rescaled by the [[~~Grid Rasterizer\|grid rasterizer~~]]. The dimensions of the test area must be 2,000 by 2,000 m. The original DEM had an offset of -200 m, which was cropped down to -20 m (= 1 grid cell) so it could function as border cell. The rescaled and cropped ASCII file will shortly be provided as part of a .zip found at the bottom of this page.		The required DEM is provided as an ASCII file (test2DEM.asc). As its cell size is 2 m, whereas the test is expected to be run on a 20-m grid, it will be automatically rescaled by the [[Rasterization model]]. The dimensions of the test area must be 2,000 by 2,000 m. The original DEM had an offset of -200 m, which was cropped down to -20 m (= 1 grid cell) so it could function as border cell. The rescaled and cropped ASCII file will shortly be provided as part of a .zip found at the bottom of this page.
	<ul>		<ul>
	<li style="display:inline-block">[[File:hmapori_case2_ukbm.png\|thumb\|x353px\|Original 2-m heightmap (2,400 m x 2,400 m)]]</li>		<li style="display:inline-block">[[File:hmapori_case2_ukbm.png\|thumb\|x353px\|Original 2-m heightmap (2,400 m x 2,400 m)]]</li>

Rudolf@tygron.nl at 14:13, 17 October 2025

2025-10-17T14:13:46Z

← Older revision		Revision as of 14:13, 17 October 2025
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	This [[Water Module benchmarks\|benchmark]] performs test case 2 of the UK EA benchmark named '''Test 2 – Filling of Floodplain Depressions''', using the {{software}}.__NOTOC__		This [[Water Module benchmarks\|benchmark]] performs test case 2 of the UK EA benchmark named '''Test 2 – Filling of Floodplain Depressions''', using the {{software}}.__NOTOC__

	The test has been designed to evaluate the capability of a package to determine inundation extent and final flood depth, in a case involving low momentum flow over a complex topography.<ref ~~name="~~Néelz~~"/>~~		The test has been designed to evaluate the capability of a package to determine inundation extent and final flood depth, in a case involving low momentum flow over a complex topography.{{ref\|Néelz}}

	A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. This is covered in more detail in [[UK EA benchmark 2 (Water Module)#Public test project\|this]] section.		A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. This is covered in more detail in [[UK EA benchmark 2 (Water Module)#Public test project\|this]] section.
			{{clear}}

	~~<br style="clear:both">~~
	==Description==		==Description==
	[[File:dem_case2_ukbm.png\|left\|thumb\|400px\|Fig. (a): Map of the DEM showing the location of the upstream boundary condition (red line), ground elevation contour lines every 0.05 m and output point locations (crosses).]]		[[File:dem_case2_ukbm.png\|left\|thumb\|400px\|Fig. (a): Map of the DEM showing the location of the upstream boundary condition (red line), ground elevation contour lines every 0.05 m and output point locations (crosses).]]

	The area modelled, shown in Fig. (a), is a perfect 2,000 m x 2,000 m square and consists of a 4 x 4 matrix of ~0.5-m deep depressions with smooth topographic transitions. The DEM (digital elevation model) was obtained by multiplying sinusoids in the north to south and west to east directions, and the resulting depressions are all identical in shape. An underlying average slope of 1:1,500 exists in the north to south direction, and of 1:3,000 in the west to east direction, with a ~2-m drop in elevation along the north-west to south-east diagonal.<ref ~~name="~~Néelz~~"/>~~		The area modelled, shown in Fig. (a), is a perfect 2,000 m x 2,000 m square and consists of a 4 x 4 matrix of ~0.5-m deep depressions with smooth topographic transitions. The DEM (digital elevation model) was obtained by multiplying sinusoids in the north to south and west to east directions, and the resulting depressions are all identical in shape. An underlying average slope of 1:1,500 exists in the north to south direction, and of 1:3,000 in the west to east direction, with a ~2-m drop in elevation along the north-west to south-east diagonal.{{ref\|Néelz}}

	The inflow boundary condition was applied along a 100-m line running south from the northwestern corner of the modelled domain, indicated by a red line in Fig. (a). A flooding with a peak flow of 20 m<sup>3</sup>/s and time base of ~85 minutes was implemented according the hydrograph in Fig. (b). The model was run for 2 days (48 hours) to allow the inundation to settle to its final state.<ref ~~name="~~Néelz~~"/>~~		The inflow boundary condition was applied along a 100-m line running south from the northwestern corner of the modelled domain, indicated by a red line in Fig. (a). A flooding with a peak flow of 20 m<sup>3</sup>/s and time base of ~85 minutes was implemented according the hydrograph in Fig. (b). The model was run for 2 days (48 hours) to allow the inundation to settle to its final state.{{ref\|Néelz}}

	[[File:flood_hydrograph_case2_ukbm.png\|left\|thumb\|x200px\|Fig. (b): Inflow hydrograph, which functioned as upstream boundary condition]]		[[File:flood_hydrograph_case2_ukbm.png\|left\|thumb\|x200px\|Fig. (b): Inflow hydrograph, which functioned as upstream boundary condition]]
	~~<br style="~~clear~~:both">~~		{{clear}}

	==Initial and boundary conditions==		==Initial and boundary conditions==
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	* Inlet Q (m<sup>3</sup>/s) : 20 in total, thus 4 per inlet		* Inlet Q (m<sup>3</sup>/s) : 20 in total, thus 4 per inlet
	[[File:inlet_q_case2_ukbm.png\|thumb\|x300px\|left\|Hydrograph for each individual inlet.]]		[[File:inlet_q_case2_ukbm.png\|thumb\|x300px\|left\|Hydrograph for each individual inlet.]]
	~~<br style="~~clear~~:both">~~		{{clear}}

	==Output as required==		==Output as required==
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	\|}		\|}

	~~Note that these~~ output values may deviate slightly from those of the initial testing phase (i.e. not the public test project), since there is a substantial time gap between when the two projects were set up, during which several changes have been made to the engine.		{{article end
			\|notes=
	~~==References=~~=		* These output values may deviate slightly from those of the initial testing phase (i.e. not the public test project), since there is a substantial time gap between when the two projects were set up, during which several changes have been made to the engine of the {{software}}.
			\| references=
	<references>		<references>
	<ref name=~~"Néelz">Néelz, S., & Pender, G. (2013).~~ Benchmarking the latest generation of 2D hydraulic modelling packages. Report: SC120002. Environment Agency, Horison House, Deanery Road, Bristol, BS1 9AH. ISBN: 978-1-84911-306-9~~. Retrieved from:~~ https://www.gov.uk/government/publications/benchmarking-the-latest-generation-of-2d-hydraulic-flood-modelling-packages ~~</ref>~~		{{ref\|Néelz
			\|name=Benchmarking the latest generation of 2D hydraulic modelling packages. Report: SC120002
			\|author=Néelz, S., & Pender, G. (2013)
			\|page=
			\|source=Environment Agency, Horison House, Deanery Road, Bristol, BS1 9AH. ISBN: 978-1-84911-306-9
			\|link=https://www.gov.uk/government/publications/benchmarking-the-latest-generation-of-2d-hydraulic-flood-modelling-packages
			\|lastvisit=
			}}
	</references>		</references>
			}}

	[[Category:Benchmarks]]		[[Category:Benchmarks]]
	{{Water Module buttons}}		{{Water Module buttons}}

Frank@tygron.nl at 15:09, 5 March 2024

2024-03-05T15:09:33Z

← Older revision		Revision as of 15:09, 5 March 2024
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	[[Image:result_case2_ukbm.gif\|~~left~~\|Animation of the test result for case 2, generated by the {{software}}. Map dimensions = 2,000 x 2,000 m. Grid-cell size = 5 m.]]		[[Image:result_case2_ukbm.gif\|right\|Animation of the test result for case 2, generated by the {{software}}. Map dimensions = 2,000 x 2,000 m. Grid-cell size = 5 m.]]
	This ~~page reports on the performance of the {{software}}'s~~ [[Water Module]] ~~by means~~ of the UK EA benchmark '''Test 2 – Filling of Floodplain Depressions'''.__NOTOC__		This [[Water Module benchmarks\|benchmark]] performs test case 2 of the UK EA benchmark named '''Test 2 – Filling of Floodplain Depressions''', using the {{software}}.__NOTOC__

	The test has been designed to evaluate the capability of a package to determine inundation extent and final flood depth, in a case involving low momentum flow over a complex topography.<ref name="Néelz"/>		The test has been designed to evaluate the capability of a package to determine inundation extent and final flood depth, in a case involving low momentum flow over a complex topography.<ref name="Néelz"/>

Rudolf@tygron.nl at 07:56, 3 March 2022

2022-03-03T07:56:01Z

← Older revision		Revision as of 07:56, 3 March 2022
Line 128:		Line 128:

	==Public test project==		==Public test project==
	A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[Wizard]] and require configuration through the [[API]].		A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[New Project Wizard]] and require configuration through the [[API]].

	===Measurement points===		===Measurement points===

Rudolf@tygron.nl at 12:47, 28 April 2021

2021-04-28T12:47:16Z

← Older revision		Revision as of 12:47, 28 April 2021
Line 129:		Line 129:
	==Public test project==		==Public test project==
	A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[Wizard]] and require configuration through the [[API]].		A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[Wizard]] and require configuration through the [[API]].

	~~An explanation of how to run the simulation can be found [[Results (Water Overlay)#Timeframes\|here]].~~

	===Measurement points===		===Measurement points===

Jorn@tygron.com: /* Public test project */

2019-07-04T09:51:52Z

Public test project

← Older revision		Revision as of 09:51, 4 July 2019
Line 128:		Line 128:

	==Public test project==		==Public test project==
	A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''~~UK Benchmark~~ 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[Wizard]] and require configuration through the [[API]].		A copy of this test project is made available to everyone, providing hands-on insights to those interested. The project can be found on the LTS server under the name '''UKEA benchmark 2'''. In this project the discussed benchmark test is reproduced, based on a map size of 2,040 m x 2,040 m to compensate for the 20-m border cells. These special map dimensions are generally not selectable in the [[Wizard]] and require configuration through the [[API]].

	An explanation of how to run the simulation can be found [[Results (Water Overlay)#Timeframes\|here]].		An explanation of how to run the simulation can be found [[Results (Water Overlay)#Timeframes\|here]].