Modelling Roland Lieste Hans Reijnders Plovdiv, Bulgaria,

Transcription

1 Modelling Roland Lieste Hans Reijnders Plovdiv, Bulgaria, Sources: Jacco Hoogewoud (RIZA) Hilde Passiers(NITG-TNO) Conceptual Models in the WFD Roland Lieste 1

2 1. Start with conceptual 2. Next schematization 3. Identify the processes 4. For implementation use programme MODFLOW Conceptual Models in the WFD Roland Lieste 2

3 conceptuel model catalogue (under construction) Conceptual Models in the WFD Roland Lieste 3

4 Modelling groundwater Bulgaria Model for mountains (in a short time the input in the system becomes discernible in surface water) River delta? Conceptual Models in the WFD Roland Lieste 4

5 Use international accepted models! Conceptual Models in the WFD Roland Lieste 5

6 Parameters Upper, middle and lower river Darcy Parameterization Boundary conditions Initial conditions Conceptual Models in the WFD Roland Lieste 6

7 Scenario s Assess effects of measures Assess trends Conceptual Models in the WFD Roland Lieste 7

8 Water Framework Directive Art. 1. Objective: Establishing a framework for the protection of inland surface waters, transitional waters, coastal waters and groundwater Art. 4. Environmental objectives: Measures to prevent decline Protect, improve and recover Annex V. Regulation Conceptual Models in the WFD Roland Lieste 8

9 The Changes River basin approach Boundary crossing river basins Obligatory results instead of obligatory effort Report to Brussels Conceptual Models in the WFD Roland Lieste 9

10 The Demands Demands w.r.t. status of groundwater (Ann. V): Quantitive Waterbalance Surface water Terrestrical ecosystems intrusions Qualitative Intrusions Quality standards (threshold values in GWDD and other directives to implement community legislation) Chemical composition (priority substances, a.s.o.) In fact nothing new (in The Netherlands)! Conceptual Models in the WFD Roland Lieste 10

11 The Task What kind of a task takes it along? Important to understand the system! What do we and what don t we understand? Where are the white spots? Conceptual Models in the WFD Roland Lieste 11

12 Conceptuel model A reproduction of reality in terms of Concepts Relations between concepts Connexion between concepts Example: Status GW Status SW Status TE Conceptual Models in the WFD Roland Lieste 12

13 Conceptuel model geohydrology Conceptual Models in the WFD Roland Lieste 13

14 Conceptuel model Objectives Conceptual Models in the WFD Roland Lieste 14

15 Profit & Necessity Conceptuel models contribute to: Insight into in operation and behaviour of a system Insight into effects of measures Development of a consistent system of concepts Rational arrangement of monitoring networks Handhold to discussions Resource to communication Exceed existing boundaries Conceptual Models in the WFD Roland Lieste 15

16 Conceptual model Is a job on its own!!!!!! Conceptual Models in the WFD Roland Lieste 16

17 Usage with respect to the WFD Example Drinking Water Monitoring (monitoring programme Maas) Conceptual Models in the WFD Roland Lieste 17

18 Usage with respect to the WFD Current monitoring drinking water in The Netherlands 1. In the aquifer in the recharge area 2. Individual pumping wells 3. Mixed water before purifying 4. After purifying 5. In the distribution network 3 2? 4 1? Near the tap Monitoring locations Conceptual Models in the WFD Roland Lieste 18

19 Usage with respect to the WFD Risk based monitoring 1. Low risk, raw water 2. Medium risk, individuel wells 3. High risk, individuel wells and also in the recharge area klei zand? zand zand Monitoring punten Conceptual Models in the WFD Roland Lieste 19

20 Usage with respect to the WFD Example Monitoring van groundwater dependent Terrestrical ecosystems (monitoring programme nature Brabant province) Conceptual Models in the WFD Roland Lieste 20

21 Usage with respect to the WFD Botanical composition Plant physiology Vegetation competition Site conditions Aeration Moisture supply Acidity Nutrient status Management Lime content Soil fertility Fertilitzation Soil Moisture content Hydrology Capillary properties Groundwater quality Surface water quality Groundwater level Upward seepage Inundation Conceptual Models in the WFD Roland Lieste 21

22 Usage with respect to the WFD Vegetation zoning (a.o.) depending on hydrology High sedge vegetation Caltha pal. meadow Juncus vegetation Low sedge vegetation Wet heathland Moist heathland Dry heathland Upstream Inundation Infiltration Downstream Regional upward seepage Local upward seepage Conceptual Models in the WFD Roland Lieste 22

23 Usage with respect to the WFD Example monitoring brooksysteem. Brook valley Selection for policy monitoring Other areas Conceptual Models in the WFD Roland Lieste 23

24 Usage with respect to the WFD Example monitoring Wet heather Selection for policy monitoring Other areas 28 areas in monitoringsystem Conceptual Models in the WFD Roland Lieste 24

25 Knowledge gaps Interaction ground water and surface water Groundwater quality vs. Surface water quality Effects of measures Ecological effects Conceptual Models in the WFD Roland Lieste 25

26 Some statements: 1. Conceptual model is a useful tool within the WFD for: Ground and surface water objectives Measures Monitoring network 2. Conceptuel models are used too few 3. Missing knowledge to make a good conceptual model: E.g. interaction ground water surface water. Conceptual Models in the WFD Roland Lieste 26