Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Metodika en final

289 views

Published on

Published in: Technology
  • Be the first to comment

  • Be the first to like this

Metodika en final

  1. 1. Програма за ТГС по ИПП България – Сърбия DEVELOPMENT OF A UNIFORM TRANS-BOUDARY METHODOLOGY FOR FLOOD RISK ASSESSMENTCONTENTS:INTRODUCTIONCHAPTER ONE 1. USED TERMINOLOGY 2. EUROPEAN APPROACHES 3. LEGISLATION AND INSTITUTIONAL FRAMEWORK 4. DATABASE 5. TYPES OF FLOODSCHAPTER TWO 1. COMMON APPROACH 2. HYDROLOGY 2.1. DETERMINATION OF THE MAXIMUM RUN-OFF 2.2. CLIMATE CHANGE 3. GEODESY 3.1. COORDINATE SYSTEMS AND PROJECTIONS 3.2. DIGITAL TERRAIN MODEL 3.3. ADDITIONAL ANALYSIS OF THE DIGITAL TERRAIN MODEL 3.4. GEODESIC SHOOTING 4. HYDRAULIC MODELLING 4.1. CALCULATION METHODS AND PROGRAMMES 4.2. CREATION OF A HYDRAULIC MODELCHAPTER THREE 1. FLOOD HAZARD MAPS 1.1. DETERMINATION OF THE INUNDATED AREAS 1.2. КCORRECTION OF THE INUNDATED AREAS 1.3. PROTECTION MEASURES 1.4. FORMATTING OF THE MAPS 2. FLOOD RISK MAPS 1.5. RISK MAPPING APPROACHES EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 1
  2. 2. Програма за ТГС по ИПП България – Сърбия 1.6. SOCIO-ECONOMIC ASPECTS 1.7. RISK CLASSIFICATION 1.8. FORMATTING OF THE MAPSCHAPTER ONEEUROPEAN APPROACHCzech RepublicOrthophotos and topographic maps, scale of 1:10 000, are used as a basis for thepreparation of flood hazard and flood risk maps in Czech Republic. The orthophotosand topographic maps are provided by the Czech Surveying Office for Mapping andCadastre (file ZABAGED).Figure 1: Orthophoto and topographic map EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 2
  3. 3. Програма за ТГС по ИПП България – СърбияFigure 2: Scheme for flood hazard and flood risk maps elaboration for given scenario(water quantity).LEGISLATION AND INSTITUTIONAL FRAMEWORKGeneral obligations of the parties with respect to the management of flood risk andcross-border cooperation are determined by international legal frameworks such asthe Water Convention of the UNECE and the Floods Directive of the EU.National legislation should set clearly defined and allocated responsibilities and rightsof all institutions and organizations that are relevant to flood risk management. EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 3
  4. 4. Програма за ТГС по ИПП България – СърбияFigure 3. Legislation and institutional framework in flood risk managament EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 4
  5. 5. Програма за ТГС по ИПП България – Сърбия Figure 4 Current organization of water management in Republic of Serbia EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 5
  6. 6. Програма за ТГС по ИПП България – СърбияFigure 5 Scheme Structure of the specialized institutions in flood risk managementDATABASECategories of databases:  Basic data  Hydrology  Hydraulics  Climate  Damage assessmentTYPES OF FLOODSThe main feature for typifying floods is their source. Depending on it, the followingtypes of floods can be defined: "sea floods", "river flooding", "rain floods", "groundwater floodings" and "infrastructure floodings".CHAPTER TWO EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 6
  7. 7. Програма за ТГС по ИПП България – Сърбия 5. HYDROLOGY 5.1. DETERMINATION OF THE MAXIMUM RUN-OFFStatistical methodsThe statistical methods are applicable for determination of the maximum run-off inbasins with built hydrometric network and an area greater than 1000 km. Thestatistical methods are applied in both countries.Models „rainfall – run-off”Figure 6 Model „Rainfall – run-off”Method for regionalization of the maximum run-off  Eight factors and characteristics of drainage basins and river systems that are essential for the formation of maximum flow are set out in LUBW, 2007:  • area of the catchment AEo [km2]  • urbanized territory S [%]  • afforestation W [%] EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 7
  8. 8. Програма за ТГС по ИПП България – Сърбия  • average slope Ig [%]  • river length L [km] along the main rivers of the watershed to the confluence  • river length LC [km] from the center of gravity of the catchment to its estuary;  • average annual rainfall in the catchment hNG [mm]  • landscape factor LF [-]GEODESYDIGITAL TERRAIN MODELA variety of sources can be used to create a terrain elevation model: topographicmaps, satellite images, orthophotos, surveys of the river flow, LIDAR. The describedsources are characterized by different accuracy of the topographical information.Therefore, the combined use of these sources is recommended to obtain a digitalterrain model with sufficient accuracy.Figure 7 Geodesic measurements /shooting of cross-sections/ EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 8
  9. 9. Програма за ТГС по ИПП България – СърбияFigure 8 Encoding of the cross section folds based on inverted cross sections of theplaneFigure 9 Generation of 3D folds of the river bed terrain EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 9
  10. 10. Програма за ТГС по ИПП България – СърбияFigure 10 Digital terrain model, developed on the basis of laser scanning dataFigure 11 Digital terrain model of river section, developed with laser scanning data EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 10
  11. 11. Програма за ТГС по ИПП България – СърбияFigure 12 conbination of laser scanning data, geometry of the facilities and folds f theterrain structureGEODESIC SHOOTINGS EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 11
  12. 12. Програма за ТГС по ИПП България – СърбияFigure 13 Method of the profiles 1. HYDRAULIC MODELLING 1.1. CALCULATION METHODS AND PROGRAMMESUse of 1D model for river section calculation (i.e. HEC-RAS)In these models, the geometry of the river valley and the river bed is laid dependingon multiple cross sections. The hydraulic impact on equipment and hinders in theriverbed,on the local expansion or narrowing, of the changes in the slope of the riverbed, etc. can be reproduced by 1D-models of the river flow. EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 12
  13. 13. Програма за ТГС по ИПП България – СърбияFigure 14 Determination of cross-sections for hydraulic measurements of the digitalterrain model (based on topographic maprs 1:5000)Figure 15 Calculated inundated areas from 1D calculations 1.2. CREATION OF A HYDRAULIC MODELUse of 2D models of the river sections (i.e. Hydro_AS-2D) EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 13
  14. 14. Програма за ТГС по ИПП България – СърбияFigure 16 2D-calculation network of the basis of elevation sports connection ofSRTM-elevation terrain model, (basis: Google Earth)Figure 17 Calculated inundated area with 2D hydraulic measurements (basis: GoogleEarth)Use of hydrologic model, based on calculation raster network for 2D calculations ofthe surface run-off (i.e. GSSHA model) EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 14
  15. 15. Програма за ТГС по ИПП България – СърбияFigure 18 Image of the modelled area with run-off model (GSSHA) based oncalculation raster network.CHAPTER THREEFLOOD HAZARD MAPSFlood hazard maps are made for the following scenarios:  flooding with low security or high repetition period (extreme floods);  flooding with medium security (≤ 1%), respectively, with an average repetition periods (≥ 100 years);  individually, floods with high security or a small repetition period.In compliance with the flood risk directive, flood hazard maps must contain thefollowing information: of flooding; of flooding and water levels; individually, flow velocity or the relevant water flow.  EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 15
  16. 16. Програма за ТГС по ИПП България – Сърбия легенда: заливни дълбочини за висока вълна с период на повторение 100 години [см] залети площи площи със свободен борд < 30 см степен на застрашеност на сгради: незастрашени сгради потенциално застрашени сградиFigure 19 Borders of inundation and calcualted depths of floods during high wavewith repetition period 100 years, respectively 1% security. легенда: застрашени зони при висока вълна с период на повторение (ПП): 10 години 50 години 20 години 100 години oпасност от заливане на сгради: незастрашени слабо застрашени (ПП > 100 год.) средно застрашени (ПП 20 -100 год.) силно застрашени (ПП < 100 год.) EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 16
  17. 17. Програма за ТГС по ИПП България – СърбияFigure 20 Borders of inundation for floods with repetition period 10, 20, 50 и 100years, respectively 10%, 5%, 2% и 1% security.Figure 21 Determination of the flood hazard in Wallone EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 17
  18. 18. Програма за ТГС по ИПП България – СърбияFigure 22 Integration of the determination methods of the repatition and inundation ofthe riverFigure 23 Exemplary flood hazard map EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 18
  19. 19. Програма за ТГС по ИПП България – СърбияFigure 24 Exemplary flood risk mapPROTECTION MEASURESIf there are protective measures against flooding, it does not necessarily mean thatthe location is protected from flooding. Often there are protection measures which donot functioning normally due to lack of maintenace and no longer correspond to themodern technologies. Even with perfectly working facilities it must be alwasysconsidered that they can not provide absolute protection at a certain risk. Often theprotection degree of the protection measures is not known exactly, so it is difficult toaccurately estimate the effect of the measures, in example for HQ100FORMATTING OF THE MAPSAccording to the Floods Directive, the flood risk assessment should covere thenegative impacts on the following protected categories "human health","environment", "cultural heritage" and "business". A prerequisite for achieving thisgoal is the definition of clear criteria for assessing the negative effects on eachprotected category separately.CALSSIFICATION OF THE RISK EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 19
  20. 20. Програма за ТГС по ИПП България – СърбияFigure 25 Exemplary map of classification of the inundated areas EUROPEAN UNION Bulgaria – Serbia IPA Cross-border Programme “Assessment of flood risk – a base for sustainable development in upper part of Nishavacatchment” Page 20

×