of the results were regularly produced during meetings and formed the basis for
exchanges between the actors.
4.1.2 Exploring River Restoration Scenarios in Model-Supported
Participatory Experiments (Grand Morin Project)
In France, the ecological management of watercourses according to the WFD partly
involves weir and dam removal to restore fish and sediment circulation. This
approach generates conflicts between some river users and public services. Between
2010 and 2013, a number of PIREN-Seine researchers proposed their models to the
local river commission of the Grand Morin River (CLE), a tributary of the Marne to
the east of the Paris, which includes public sector services, the river union, the
fishermen’s association, the canoe/kayak clubs, elected officials and mill owners.
The expectations of the commission members at the beginning of the experiment
partly reflected their divergence: for the public sector services, the experiment
should facilitate weir removal by silencing the controversies over the interest in
and effectiveness of levelling, whereas most members of the CLE oppose the limited
and partial nature of the scientific information on the subject (ecological interest in
suppressing weirs).
The ProSe model was chosen to simulate flow variations on the watercourse and
the Anaqualand model for the ability of fish to move along the river. Several
workshops and field trips made it possible to collectively define the question to be
addressed (What happens to the river and the ecosystem by manipulating the weirs
and varying the water level?) and the actors concerned. They made it possible to
explain the information provided by the two models, as well as their limitations, so
that the actors could evaluate for themselves the effects of the weirs on the hydraulic
functioning of the river, on its uses (kayaking, mills) and the circulation of three
species of fish.
The interactive platform made it possible to simulate management of the works
by various actors according to objectives chosen by all the participants based on the
river discharge, which was also chosen by the participants. Each participant can play
a different role. The model simulates the effects of the decisions made on the chosen
indicators (water level in the diverted reaches, crossing of structures by canoes or
different types of fish species). The results were displayed and discussed according
to the objectives of each operator. Management decisions were evaluated collectively, thereby allowing for new simulations [34].
4.1.3 Building Territorial Dialogue to Act on Agricultural Diffuse
Pollution (BRIE’eau Project)
The BRIE’eau project (2016–2020) aims to make the particularly controversial issue
of agricultural water pollution (nitrates and pesticides) in the Brie region of Seine-etMarne, a subject of debate. In this territory of large cereal crops, agricultural activity
404
C. Carré et al.
exchanges between the actors.
4.1.2 Exploring River Restoration Scenarios in Model-Supported
Participatory Experiments (Grand Morin Project)
In France, the ecological management of watercourses according to the WFD partly
involves weir and dam removal to restore fish and sediment circulation. This
approach generates conflicts between some river users and public services. Between
2010 and 2013, a number of PIREN-Seine researchers proposed their models to the
local river commission of the Grand Morin River (CLE), a tributary of the Marne to
the east of the Paris, which includes public sector services, the river union, the
fishermen’s association, the canoe/kayak clubs, elected officials and mill owners.
The expectations of the commission members at the beginning of the experiment
partly reflected their divergence: for the public sector services, the experiment
should facilitate weir removal by silencing the controversies over the interest in
and effectiveness of levelling, whereas most members of the CLE oppose the limited
and partial nature of the scientific information on the subject (ecological interest in
suppressing weirs).
The ProSe model was chosen to simulate flow variations on the watercourse and
the Anaqualand model for the ability of fish to move along the river. Several
workshops and field trips made it possible to collectively define the question to be
addressed (What happens to the river and the ecosystem by manipulating the weirs
and varying the water level?) and the actors concerned. They made it possible to
explain the information provided by the two models, as well as their limitations, so
that the actors could evaluate for themselves the effects of the weirs on the hydraulic
functioning of the river, on its uses (kayaking, mills) and the circulation of three
species of fish.
The interactive platform made it possible to simulate management of the works
by various actors according to objectives chosen by all the participants based on the
river discharge, which was also chosen by the participants. Each participant can play
a different role. The model simulates the effects of the decisions made on the chosen
indicators (water level in the diverted reaches, crossing of structures by canoes or
different types of fish species). The results were displayed and discussed according
to the objectives of each operator. Management decisions were evaluated collectively, thereby allowing for new simulations [34].
4.1.3 Building Territorial Dialogue to Act on Agricultural Diffuse
Pollution (BRIE’eau Project)
The BRIE’eau project (2016–2020) aims to make the particularly controversial issue
of agricultural water pollution (nitrates and pesticides) in the Brie region of Seine-etMarne, a subject of debate. In this territory of large cereal crops, agricultural activity
404
C. Carré et al.