waarde van grondwaterbigfiles.nhv.nu/nieuwegein2015/07_theo_olsthoorn.pdf · example, black feet in...
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Waarde van grondwater
Theo Olsthoorn
Olsthoorn 23/09/2015 1Waarde van Grondwater
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Olsthoorn 23/09/2015 Waarde van Grondwater 3https://www.youtube.com/watch?v=fnLV6Jk7WRk
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Irrigation wells in the Ogalla in South-West Kansas USA
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Olsthoorn Nieuwegein 23/09/2015 6De Waarde van Grondwater
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Prof. ir. L. Huisman1919 - 1997
Juni 1974Olsthoorn 23/09/2015 10Waarde van Grondwater
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De Volgermeer is volgens de Dienst Milieu en Bouwtoezicht van de gemeente Amsterdam de grootste en meest vervuilde locatie van Nederland.
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Prof W.F.J.M.Krul
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Example, black feet
In the village of Dalipara, ten miles north of Chittagong, housewife and mother Laila Begum extracts groundwater using a pump. Until recently, she drank it regularly. But she stopped when a series of brown lumps started appearing on her skin - the first symptoms of arsenic poisoning.
(This site shows pictures of arsenicosis, it may make you sick: http://phys4.harvard.edu/~wilson/arsenic/pictures/arsenic_project_pictures2.html)
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Arsenic in Bangladesh
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Pyrite (FeS2) (Dutch working group on pyrite)Olsthoorn 23/09/2015 20Waarde van Grondwater
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FeS2 oxidized releasing AsAs may be released also by ion exchange by PO4
3-
Deep polder Horstermeer invokes groundwater flow from higher level lakes through peat. Oxidation by pyrite releases As, which accumulates in the sludge in the ditches in the low lying polder that receives the groundwater
Polder was put dry (1870) after a lakes was created by mining of torf during previous centuries
Holland Peat
Fe2+, <SO42-, <As
Clayey sandsSilty claysFormation of Calais
Basal Peat
Fe2+, SO42-, As FeS2
FeOOH
FeS2+O2
FeS2-formation?
<Fe2+, <<SO42-, <<As
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Schemtic representation of local intermediate and regional groundwater systems
Subsystem boundary
System boundary
Flow path
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Soortensamenstelling bepaald door:
Vochtregiem (water en zuurstof) Nutriënten beschikbaarheid Zuurgraad Zoutconcentratie
Conditioned by water!
Ecologie
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Grondwaterperspectief
Vanuit de natuurde landbouw
de mens
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Winter en voorjaar velden niet blank Zomer hoge grondwaterstand Hoge gronden: Irrigeren met grondwater Elders ook met oppervlaktewater mits niet te zout
Landbouw
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Breda, original brooks & current situation with intense dewatering systemOlsthoorn 23/09/2015 33Waarde van Grondwater
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Breda, original brooks & current situation with intense dewatering systemOlsthoorn 23/09/2015 34Waarde van Grondwater
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Many small local systems cause rapid discharge remain after taking natural area into (agricultural) use and dewatering has been optimized for agriculture
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Droge voeten Smetteloos drinkwater Steeds meer andere activiteiten in de ondergond
De mens
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Jong water < 100 j100 < Gemiddeld oud < 25000 j
Oud of oerwater > 25000 j
Brabants grondwater:
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Oirschot drinkt bronwatermet keurmerk
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What do we do?
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Raakt het grondwaterooit op ??
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The Ogalalla aquifer
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Nubian Sandstone Aquifer
Egypt, Lybia, Sudan, Chad
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Dessication (verdroging)
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