Impacts of river management on low energy rivers in Normandy (France) over 3000 years, first results of a geomorphological and geoarchaeological approach.
Axel Beauchamp
(1)
,
Laurent Lespez
(2)
,
Ludovic Le Gaillard
(3)
,
Vincent Bernard
(4)
,
Daniel Delahaye
(5)
1
LETG -
Littoral, Environnement, Télédétection, Géomatique UMR 6554
2 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
3 Inrap - Institut national de recherches archéologiques préventives
4 CReAAH - Centre de Recherche en Archéologie, Archéosciences, Histoire
5 LETG - Caen - Littoral, Environnement, Télédétection, Géomatique
2 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
3 Inrap - Institut national de recherches archéologiques préventives
4 CReAAH - Centre de Recherche en Archéologie, Archéosciences, Histoire
5 LETG - Caen - Littoral, Environnement, Télédétection, Géomatique
Axel Beauchamp
- Fonction : Auteur
- PersonId : 14517
- IdHAL : axel-beauchamp
- IdRef : 164253866
Laurent Lespez
- Fonction : Auteur
- PersonId : 5330
- IdHAL : lespez
- ORCID : 0000-0003-3256-1999
- IdRef : 095000461
Vincent Bernard
- Fonction : Auteur
- PersonId : 182293
- IdHAL : vincent-bernard
- IdRef : 050534076
Daniel Delahaye
- Fonction : Auteur
- PersonId : 6196
- IdHAL : daniel-delahaye
- ORCID : 0000-0002-4965-6815
- IdRef : 162070934
Résumé
The European Water Framework Directive (WFD), issued in 2000 has the objective of improving the quality of water and aquatic environments. In France, the application of this law requires the dismantling and razing of structures built across waterways (mill valve, mill dam…) which no longer have any use today. The first archaeological results in Normandy show evidence of river management since the Iron Age (800 BC.). They also show that during the last 4000 years, floodplains have been affected by a significant vertical aggradation resulting from soil erosion in the catchment related to the development of agro- pastoral activities. However, these results say nothing about consequences of the proliferation of mill dams for hydrosedimentary flow for low energy rivers and their role in the development of sedimentary stocks in valley beds. The aim of this work is to measure the impact of the implementation of major hydraulic structures (mill inlet, mill dam, millrace, mill valve, drainage ditches...) on the rivers functioning in the past millennia to (1) propose a long term modeling Human/Ecosystem interaction for Lower-Normandy river systems and (2) to anticipate the geomorphological consequences related to dam-removal policy. This research is based on study sites located in the valley bed, most of them have been investigated by archaeologists and have revealed old hydraulic structures. Today, five sites have been identified in varied archaeological and hydromorphological contexts. Trenching was carried out upstream and downstream of hydraulic structures to uncover the Holocene sedimentary infilling of the valley floor. First results from the antique and medieval sites Montaigu-la-Brisette (Manche, FRANCE ) and Colomby (Manche, FRANCE ) show the influence of river management on the evolution of sedimentation in valley bed.
Format du dépôt | Notice |
---|---|
Type de dépôt | Communication dans un congrès |
Titre |
en
Impacts of river management on low energy rivers in Normandy (France) over 3000 years, first results of a geomorphological and geoarchaeological approach.
|
Résumé |
en
The European Water Framework Directive (WFD), issued in 2000 has the objective of improving the quality of water and aquatic environments. In France, the application of this law requires the dismantling and razing of structures built across waterways (mill valve, mill dam…) which no longer have any use today. The first archaeological results in Normandy show evidence of river management since the Iron Age (800 BC.). They also show that during the last 4000 years, floodplains have been affected by a significant vertical aggradation resulting from soil erosion in the catchment related to the development of agro- pastoral activities. However, these results say nothing about consequences of the proliferation of mill dams for hydrosedimentary flow for low energy rivers and their role in the development of sedimentary stocks in valley beds. The aim of this work is to measure the impact of the implementation of major hydraulic structures (mill inlet, mill dam, millrace, mill valve, drainage ditches...) on the rivers functioning in the past millennia to (1) propose a long term modeling Human/Ecosystem interaction for Lower-Normandy river systems and (2) to anticipate the geomorphological consequences related to dam-removal policy. This research is based on study sites located in the valley bed, most of them have been investigated by archaeologists and have revealed old hydraulic structures. Today, five sites have been identified in varied archaeological and hydromorphological contexts. Trenching was carried out upstream and downstream of hydraulic structures to uncover the Holocene sedimentary infilling of the valley floor. First results from the antique and medieval sites Montaigu-la-Brisette (Manche, FRANCE ) and Colomby (Manche, FRANCE ) show the influence of river management on the evolution of sedimentation in valley bed.
|
Auteur(s) |
Axel Beauchamp
1
, Laurent Lespez
2
, Ludovic Le Gaillard
3
, Vincent Bernard
4
, Daniel Delahaye
5
1
LETG -
Littoral, Environnement, Télédétection, Géomatique UMR 6554
( 14266 )
- Institut Universitaire Européen de la Mer - Technopôle Brest-Iroise - Place Nicolas Copernic 29280 Plouzané
- France
2
LGP -
Laboratoire de géographie physique : Environnements Quaternaires et Actuels
( 1343 )
- 2 rue Henri Dunant
94320 Thiais
- France
3
Inrap -
Institut national de recherches archéologiques préventives
( 301475 )
- 121 rue d'Alésia
75014 Paris
- France
4
CReAAH -
Centre de Recherche en Archéologie, Archéosciences, Histoire
( 206481 )
- Université de Rennes 1
Bâtiment 24-25 Campus de Beaulieu
263, Avenue du général Leclerc
Campus de Beaulieu
CS 74205 -
35042 Rennes Cedex- France
- France
5
LETG - Caen -
Littoral, Environnement, Télédétection, Géomatique
( 929 )
- Esplanade de la Paix, CS 14032, 14032 Caen cedex 5
- France
|
Langue du document |
Anglais
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Invité |
Non
|
Audience |
Internationale
|
Actes |
Non
|
Titre du congrès |
EGU General Assembly
|
Date début congrès |
2014-04-27
|
Ville |
Vienne
|
Pays |
Autriche
|
Domaine(s) |
|
ADS Id | 2014EGUGA..16.4887B |
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