A GIS Tool for Reduction Day Precipitation to...
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A GIS Tool for Reduction Day Precipitation to Subday Martin Landa (*) , Petr Kavka (**) , Luděk Strouhal (***) (*) Department of Geomatics (**)/ (***) Department of Irrigation, Drainage and Landscape Engineering, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic (*) [email protected] (**) [email protected], (***) [email protected] Intro Subday design precipitation series are important for hydrological modelling and soil erosion problems in a small catchment scale when designing common measures for promoting water retention, landscape drainage systems, etc. Project The project with the name "Variability of Short-term Precipitation and Runoff in Small Czech Drainage Basins and its Influence on Water Resources Management" is based on the precipitation scenarios analysis from observed data of point gauging stations and radar data in terms of events’ return period, rainfall total amount, inter- nal intensity distribution and spatial distribution over the area of the Czech Republic. The project has been launched in April 2015. Goal The goal is to provide a tool to the public as a stand-alone program and later also as a web geoprocessing service. The tool uses methods of zonal statistics to compute average values of design 24 hours precip- itation for a selected area or for a spot. This value is reduced to the chosen length design rain for selected period of repetition. Workflow First automatization has been implemented by well-known method which is based on reduction of 24 hours design precipitation to shorter time. GIS is used for spatial supervised classification of point values of specified repetition periods (2, 10, 20, 50 a 100 years) over the area of the Czech Republic. Input data Basins (in orange) with orthophoto on background + Repetition periods (2, 10, 20, 50 years) in the area of the Czech Republic New GRASS module The tool for reduction of daily precipitation r.subdayprecip.design has been implemented for GRASS GIS (http://grass.osgeo.org) using Py- GRASS and Python Scripting Library. It is available as Addon [4]. Graphical User Interface r.subdayprecip.design map=basin raster=H_002,H_005,H_010,H_020 rainlength=60 Command Line Syntax where rainlength is rain length value in minutes. Output data cat BASIN H_002_60 [mm] H_005_60 [mm] H_010_60 [mm] H_020_60 [mm] 3 2-02-01-060 18.9 24.9 33.7 44.3 4 2-04-02-015 21.4 29.9 39.9 52.6 5 2-04-04-098 26.2 34.9 51.0 67.0 ... Basins colored by H_002_60 value Geoprocessing service The tool is also available as Web Processing Service (WPS). The ser- vice is based on r.subdayprecip.design GRASS module and published using PyWPS framework (http://pywps.wald.intevation.org). WPS process called from QGIS WPS Plugin References 1.Torfs, P. J. J. F., Horacek, S., & Rakovec, O. (2010). Chimera, a framework for conceptual modelling using analytical sensitives to parameters: implementation and application to PDM model. 2. Sokol, Z., & Bližňák, V. (2009). Areal distribution and precipitation–altitude relationship of heavy short-term precipitation in the Czech Republic in the warm part of the year. Atmospheric Research, 94(4), 652-662. 3. Markus Neteler, M. Hamish Bowman, Martin Landa, Markus Metz, GRASS GIS: A multi- purpose open source GIS, Environmental Modelling & Software, Volume 31, May 2012, Pages 124-130, ISSN 1364-8152, http://dx.doi.org/10.1016/j.envsoft.2011.11.014. 4. GRASS module r.subdayprecip.design http://grass.osgeo.org/grass70/manuals/addons/r.subdayprecip.design.html About project This work has been supported by the research project QJ1520265 - "Variabil- ity of Short-term Precipitation and Runoff in Small Czech Drainage Basins and its Influence on Water Resources Management". c 2015 OSGeoREL at FCE CTU, Martin Landa This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 Czech Republic License.
Transcript of A GIS Tool for Reduction Day Precipitation to...
A GIS Tool for Reduction Day Precipitation to SubdayMartin Landa(∗), Petr Kavka(∗∗), Luděk Strouhal(∗∗∗)
(∗)Department of Geomatics (∗∗)/(∗∗∗)Department of Irrigation, Drainage and Landscape Engineering,Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic
(∗)[email protected] (∗∗)[email protected], (∗∗∗)[email protected]
Intro Subday design precipitation series are important for hydrological modelling and soil erosion problems in a small catchment scale when designing common measuresfor promoting water retention, landscape drainage systems, etc.
Project
The project with the name "Variability of Short-term Precipitation and Runoff inSmall Czech Drainage Basins and its Influence on Water Resources Management"is based on the precipitation scenarios analysis from observed data of point gaugingstations and radar data in terms of events’ return period, rainfall total amount, inter-nal intensity distribution and spatial distribution over the area of the Czech Republic.The project has been launched in April 2015.
GoalThe goal is to provide a tool to the public as a stand-alone programand later also as a web geoprocessing service. The tool uses methodsof zonal statistics to compute average values of design 24 hours precip-itation for a selected area or for a spot. This value is reduced to thechosen length design rain for selected period of repetition.
Workflow
First automatization has been implemented by well-known method which is based on reduction of 24 hours design precipitation to shorter time. GIS is used for spatialsupervised classification of point values of specified repetition periods (2, 10, 20, 50 a 100 years) over the area of the Czech Republic.
Input data
Basins (in orange) with orthophoto onbackground
+
Repetition periods (2, 10, 20, 50 years) in the area ofthe Czech Republic
New GRASS moduleThe tool for reduction of daily precipitationr.subdayprecip.design has been implemented forGRASS GIS (http://grass.osgeo.org) using Py-GRASS and Python Scripting Library. It is availableas Addon [4].
Graphical User Interface
r.subdayprecip.design map=basinraster=H_002,H_005,H_010,H_020rainlength=60
Command Line Syntaxwhere rainlength is rain length value in minutes.
Output data
cat BASIN H_002_60 [mm] H_005_60 [mm] H_010_60 [mm] H_020_60 [mm]3 2-02-01-060 18.9 24.9 33.7 44.34 2-04-02-015 21.4 29.9 39.9 52.65 2-04-04-098 26.2 34.9 51.0 67.0...
Basins colored by H_002_60 value
Geoprocessing service
The tool is also available as Web Processing Service (WPS). The ser-vice is based on r.subdayprecip.design GRASS module and publishedusing PyWPS framework (http://pywps.wald.intevation.org).
WPS process called from QGIS WPS PluginReferences1. Torfs, P. J. J. F., Horacek, S., & Rakovec, O. (2010). Chimera, a framework for conceptual
modelling using analytical sensitives to parameters: implementation and application toPDM model.
2. Sokol, Z., & Bližňák, V. (2009). Areal distribution and precipitation–altitude relationshipof heavy short-term precipitation in the Czech Republic in the warm part of the year.Atmospheric Research, 94(4), 652-662.
3. Markus Neteler, M. Hamish Bowman, Martin Landa, Markus Metz, GRASS GIS: A multi-purpose open source GIS, Environmental Modelling & Software, Volume 31, May 2012,Pages 124-130, ISSN 1364-8152, http://dx.doi.org/10.1016/j.envsoft.2011.11.014.
4. GRASS module r.subdayprecip.designhttp://grass.osgeo.org/grass70/manuals/addons/r.subdayprecip.design.html
About projectThis work has been supported by the research project QJ1520265 - "Variabil-ity of Short-term Precipitation and Runoff in Small Czech Drainage Basinsand its Influence on Water Resources Management".
c© 2015 OSGeoREL at FCE CTU, Martin LandaThis work is licensed under the Creative
Commons Attribution-ShareAlike 4.0 Czech Republic License.
