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6 ningen i Gjern Å systemet viser, at georadar kan anvendes til kortlægningen af de øverste 3 – 4 m af en ådals aflejringer. Nærværende projekt er en direkte videreførelse af et <strong>Miljøstyrelsen</strong> udredningsprojekt, som Danmarks og Grønlands Geololgiske Undersøgelse (GEUS) og Danmarks Miljøundersøgelser (DMU) gennemførte i 2001 med titlen ”Videnstatus for Sammenhængen mellem Grundvand og Overfladevand” (Refsgaard med flere, 2002). Der blev heri opstillet et katalog over vidensbehov inden for emneområdet. Nærværende projekt er det højest prioriterede vidensbehov i projektkataloget og er gennemført af GEUS, DMU og Aarhus Universitet (AU).
Summary and conclusions Introductory work on implementation of the EU Water Framework Directive have outlined the criteria for classification of the physical-chemical status of groundwater and surface water bodies, knowing that the quantitative status of a groundwater body may have an impact on the ecological quality of surface waters interacting with that groundwater body. Implementation of Water Districts in Denmark (before end of the year 2004) will be accompanied by the definition of good or bad status of individual ground water bodies. During the same period a stream typology will be carried out to classify ecological quality of different stream types in Denmark. To obtain coherence between the two classifications it is nessesary to divide the stream valleys into components with unique parameter sets of physical, chemical and biological parameters. The objective of this report is to present a methodology to classify stream valleys into type locations based on geologic and stream valley morphological principles. Groundwater and surface water interact differently in different types of stream valleys. The same is true for water soluble solutes that can be degraded by or desorbed from wetland sediments to ground water flowing through the stream valley aquifer. The key to understanding the complicated flow and degradation processes that occur in the stream valley aquifer is the identification of unique parameters values that characterize the individual stream valley types. Such an understanding is needed before the interaction between groundwater and surface water in stream valleys can be quantified. A new classification of groundwater – surface water interaction types of Danish stream valleys is presented in this report and it has got the acronym GOI, which is identical with the English term GSI (Ground water - Surface water Interaction). It is necessary to define type locations in order to classify the hydraulic and degradation / trans<strong>format</strong>ion rates in the representative type areas. Stream valleys occurring in unaffected (natural) conditions and those impacted by anthropogenic conditions (such as artificial draining of wetlands) are represented in the classification system. Based on a comprehensive knowledge of Danish stream valley and wetland studies different field examples have been identified. In this report one example is presented to show that the methodology and working procedures are applicable to different GOI types along the Haller Å. This example shows that it is possible to a limited extent to determine the flow distribution of groundwater through the stream valley aquifer; the residence or contact time and the degradation potential of the individual stream valley types.. Therefore further testing, validation and operationalization of the typology is needed. It is recommended that additional Danish locations are examined based on the new classification system in order to determine the ranges of individual parameters under different stream valley conditions. A field verification program has been developed to support the characterization of the representative parameter sets of individual stream valley types. The georadar method was tested at three type localities in the Gjern Å catchment to determine the functionality of the method for use in mapping geometric conditions and in analyzing the lithologic conditions of wetland sediments in 7
Page 1 and 2: Arbejdsrapport fra Miljøstyrelsen
Page 3 and 4: Indhold SAMMENFATNING OG KONKLUSION
Page 5: Sammenfatning og konklusioner Ved f
Page 9 and 10: 1 Indledning 1.1 Projektformål For
Page 11 and 12: at opnå sammenhæng mellem udpegni
Page 14 and 15: 14 2 Ådalens tilblivelse 2.1 Danne
Page 16 and 17: 16 I Vestjylland anvendtes tidliger
Page 18 and 19: 18 Tabel 2.3 Deponering af sediment
Page 20 and 21: 20 Figur 3.1. Konceptuel skitse ove
Page 22 and 23: 22 ende hydrauliske parametre en me
Page 24 and 25: 24 fattigt. Det vil endvidere sands
Page 26 and 27: 26 samme samlede afstrømmende vand
Page 28 and 29: 28 Figur 3.5. Hydrogeologiske profi
Page 30 and 31: 30 3.2.2 Biogeokemiske processer i
Page 32 and 33: 32 3.2.4 Faktorer af betydning for
Page 34: 34 niummineraler (Richardson, 1985)
Page 37 and 38: Figur 4.1. Illustration af definiti
Page 39 and 40: VI Antropogen(e) variant(er) Antrop
Page 41 and 42: I glacialt dominerede områder, hvo
Page 43 and 44: kolonne er opført henholdsvis åda
Page 45 and 46: Tabel 4.3 Karakterisering og beskri
Page 47 and 48: f.eks. ådalens aflejringer hydraul
Page 49 and 50: • Dambrug Eksempel: Barslund Bæk
Page 51 and 52: GERDA). Er den regionalgeologiske o
Page 53 and 54: Figur 4.5. A. Stor grundvandsudstr
Page 55 and 56: Luftfotos 1:25.000 F.eks. Danish Se
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(Geodætisk Institut, 1979a og b);
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Figur 4.12. Nordlig og sydlig skræ
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kapitlet. Ved Stordal er der observ
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De menneskeskabte varianter ’Deta
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5.1.1 Hydraulisk ledningsevne Det o
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Figur 5.1 Den hydrauliske ledningse
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Q 3 Q 2 Q 1 Ådalsmagasin Figur 5.2
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dere dækkede undersøgelsen en 860
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Figur 5.6. Lavmose ved Voldby Bæk
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Ved Stevns Å nær Hellested viste
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Figur 5.10. Lokaliteter ved Haller
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vandløbet. Målingerne tyder på,
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Tabel 5.3 Opsummering af styrende p
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- skal analyserne i feltprogrammets
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6.5 Forslag til aftestningsområder
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Figur 6.1. Sensors and Software pul
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Figur 6.3. Georadarprofiler fra Sø
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92 I fase 3 udvikles og testes oper
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94 Bærentzen, R. 1997. Opstilling
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96 Hoffmann, C.C., Pedersen, M.L. a
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98 Ph. D. afhandlingen ”Stream-fl
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100 Winter, T.C. 1995a. Recent adva
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102 reducerede forhold dominerer de
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104 Bilag 2 Hydrologiske processer
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106 På figur B2.2 er en typisk geo
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108 Figur B2.3 Karakteristiske åda
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110 Bilag 3 Redoxprocesser Elektrok
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112 Bilag 4 Testkortlægning med ge
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114 Figur B4.4 Georadarprofilerne L
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116 Søbyvad Langs Gjern Å ved Sø
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118 Figur B4.8 Georadarprofilerne L
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120 Smingevad Langs Gjern Å ved Sm
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