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Hydrogeological investigation for the PEGASUS project, southern Skåne, Sweden

Andersson, Pontus (2010) In Dissertations in Geology at Lund University
Department of Geology
Abstract
SLU (Swedish University of Agricultural Sciences) have had a project ongoing in a catchment area in
southern Skåne for 20 years where they study how pesticide occurrence in surface waters correlate to the sort and
amount used on the agricultural fields. A new project started by SGI (Swedish Geotechnical Institute) called
PEGASUS (PEsticide occurrence in Groundwater, A Study for sustainable Use in Skåne) has begun an investigation
in the same catchment to study the pesticide behavior and effects in the deeper groundwater. This paper is a
geological and hydrogeological investigation of the catchment area for the PEGASUS project.
The catchment area is located in a valley that is partly formed by a river and partly by faulting. The... (More)
SLU (Swedish University of Agricultural Sciences) have had a project ongoing in a catchment area in
southern Skåne for 20 years where they study how pesticide occurrence in surface waters correlate to the sort and
amount used on the agricultural fields. A new project started by SGI (Swedish Geotechnical Institute) called
PEGASUS (PEsticide occurrence in Groundwater, A Study for sustainable Use in Skåne) has begun an investigation
in the same catchment to study the pesticide behavior and effects in the deeper groundwater. This paper is a
geological and hydrogeological investigation of the catchment area for the PEGASUS project.
The catchment area is located in a valley that is partly formed by a river and partly by faulting. The river’s course is
anthropogenically modified by a culvert system draining the agricultural fields and the river emerges first in the SE
part of the catchment area. The valley sediments consist of an upper and lower glaciofluvial sand divided by a silty
clay layer. The surface sediments consist of a clayrich till which makes up 90 % of the surface sediments, the remaining
10 % consists of glaciofluvial sediments and postglacial sediments.
There are two groundwater divides within the investigated aquifer, one in the northern part of the catchment area
and one to the west of the catchment area. The groundwater gradient follows the surface water gradient which is SE
and E towards the river. The recharge from surface water to the upper aquifer is low meaning that recharge likely
occurs during heavy precipitation periods. The average age of the groundwater is c. 40-60 years. The hydraulic conductivity
was calculated based on three different methods, Hazen’s method, slugtest and percolation tube test. The
results varied between these methods but the general hydraulic conductivity of the upper aquifer ranges from 2*10-4
m/s, for the coarsest sediments, to 2*10-7 m/s, for the finest sediments. (Less)
Abstract (Swedish)
SLU (Sveriges Lantbruksuniversitet) har ett pågående projekt i ett område i södra Skåne sedan
1989 där de studerar hur bekämpningsmedel i åar korrelerar med vad som används på åkrarna. Ett nytt projekt, initierat
av SGI (Statens Geotekniska Institut), kallat PEGASUS (PEsticide occurrence in Groundwater, A Study for
sustainable Use in Skåne) har påbörjat en undersökning i samma område för att studera hur bekämpningsmedel
uppför sig och påverkar grundvattnet. Detta arbete är en geologisk och hydrogeologisk undersökning av området åt
PEGASUS-projektet.
Området ligger i en dalgång som dels är formad av en flod och dels av förkastningar. Floden har sin början i sydöstra
delen av området. Dalgången är fylld med glaciala flodsediment. De... (More)
SLU (Sveriges Lantbruksuniversitet) har ett pågående projekt i ett område i södra Skåne sedan
1989 där de studerar hur bekämpningsmedel i åar korrelerar med vad som används på åkrarna. Ett nytt projekt, initierat
av SGI (Statens Geotekniska Institut), kallat PEGASUS (PEsticide occurrence in Groundwater, A Study for
sustainable Use in Skåne) har påbörjat en undersökning i samma område för att studera hur bekämpningsmedel
uppför sig och påverkar grundvattnet. Detta arbete är en geologisk och hydrogeologisk undersökning av området åt
PEGASUS-projektet.
Området ligger i en dalgång som dels är formad av en flod och dels av förkastningar. Floden har sin början i sydöstra
delen av området. Dalgången är fylld med glaciala flodsediment. De glaciala flodsedimenten kan delas upp i två
sedimentenheter, en övre enhet och en undre enhet. Dessa delas av ett lerlager som ligger mellan dem. De översta
sedimenten består till 90 % av leriga moräner och de övriga 10 % består av glaciala flodsediment och andra senglaciala
sediment.
Där finns två stycken grundvattendelare i området som skärmar av det undersökta magasinet från andra närliggande,
den första grundvattendelaren ligger norr om området och den andra väster om området. Grundvattnet i det övre
magasinet har en gradient och ett flöde mot ån. Från vattenbalansberäkningar kan vi konstatera att akvifären fylls
på med mycket lite vatten uppifrån och att påfyllning troligen sker vid perioder av kraftigt regn. Vattnets ålder är c.
40-60 år. Den hydrauliska konduktiviteten beräknades med hjälp av tre olika metoder, Hazen’s metod, slug-test och
perkolationsrörs-test. Resultaten varierade mellan de olika metoderna men den generella hydrauliska konduktiviteten
varierar från 2*10-4 m/s, för de grövsta sedimenten, till 2*10-7 m/s, för de finaste sedimenten. (Less)
Please use this url to cite or link to this publication:
author
Andersson, Pontus
supervisor
organization
alternative title
Hydrogeologisk undersökning för PEGASUSprojektet, södra Skåne, Sverige
year
type
H1 - Master's Degree (One Year)
subject
keywords
south Sweden, hydrogeologi, geologi, södra Skåne, södra Sverige, south Skåne, geology, hydrogeology, PEGASUS
publication/series
Dissertations in Geology at Lund University
report number
259
language
English
id
2296639
date added to LUP
2012-02-07 10:50:43
date last changed
2012-02-07 10:50:43
@misc{2296639,
  abstract     = {SLU (Swedish University of Agricultural Sciences) have had a project ongoing in a catchment area in
southern Skåne for 20 years where they study how pesticide occurrence in surface waters correlate to the sort and
amount used on the agricultural fields. A new project started by SGI (Swedish Geotechnical Institute) called
PEGASUS (PEsticide occurrence in Groundwater, A Study for sustainable Use in Skåne) has begun an investigation
in the same catchment to study the pesticide behavior and effects in the deeper groundwater. This paper is a
geological and hydrogeological investigation of the catchment area for the PEGASUS project.
The catchment area is located in a valley that is partly formed by a river and partly by faulting. The river’s course is
anthropogenically modified by a culvert system draining the agricultural fields and the river emerges first in the SE
part of the catchment area. The valley sediments consist of an upper and lower glaciofluvial sand divided by a silty
clay layer. The surface sediments consist of a clayrich till which makes up 90 % of the surface sediments, the remaining
10 % consists of glaciofluvial sediments and postglacial sediments.
There are two groundwater divides within the investigated aquifer, one in the northern part of the catchment area
and one to the west of the catchment area. The groundwater gradient follows the surface water gradient which is SE
and E towards the river. The recharge from surface water to the upper aquifer is low meaning that recharge likely
occurs during heavy precipitation periods. The average age of the groundwater is c. 40-60 years. The hydraulic conductivity
was calculated based on three different methods, Hazen’s method, slugtest and percolation tube test. The
results varied between these methods but the general hydraulic conductivity of the upper aquifer ranges from 2*10-4
m/s, for the coarsest sediments, to 2*10-7 m/s, for the finest sediments.},
  author       = {Andersson, Pontus},
  keyword      = {south Sweden,hydrogeologi,geologi,södra Skåne,södra Sverige,south Skåne,geology,hydrogeology,PEGASUS},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertations in Geology at Lund University},
  title        = {Hydrogeological investigation for the PEGASUS project, southern Skåne, Sweden},
  year         = {2010},
}