# First analysis of a large panel of restoration operations on riverbanks with soil bioengineering techniques in France

Delphine Jaymond, André Evette, Camille Guilloteau, Frédéric Bray, André

Torre, Vincent Breton, Sébastien de Danieli

<figure><img src="image_1.png" /></figure>

## ► To cite this version:

Delphine Jaymond, André Evette, Camille Guilloteau, Frédéric Bray, André Torre, et al. First analysis of a large panel of restoration operations on riverbanks with soil bioengineering techniques in France. 6th Symposium of the International Society for River Science, International Society for River Science, Sep 2019, Vienne, Austria. pp.1, 10.13140/RG.2.2.10573.14564. hal-02610192

HAL Id: hal-02610192

https://hal.inrae.fr/hal-02610192v1

Submitted on 2 Apr 2025

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<figure><img src="image_2.png" /></figure>
# First analysis of a large panel of restoration operations on riverbanks with soil bioengineering techniques in France

Delphine JAYMOND, André EVETTE, Frédéric BRAY, Camille GUILLOTEAU, André TORRE, Vincent BRETON, Sébastien de DANIELI

11/09/2019
# Introduction

Riparian vegetation on riverbanks : ecological services (for instance, as ecological corridor)

Important biodiversity compared to their area, natural phenomena of erosion
# Introduction

Riparian vegetation on riverbanks : ecological services (for instance, as ecological corridor)

Important biodiversity compared to their area, natural phenomena of erosion

But human issues imply to control bank erosion

Three types of works on riverbanks :

- Civil engineering

- Soil bioengineering

- Mixed techniques
# Introduction

Riparian vegetation on riverbanks : ecological services (for instance, as ecological corridor)

Important biodiversity compared to their area, natural phenomena of erosion

But human issues imply to control bank erosion

Three types of works on riverbanks :

- Civil engineering

- Soil bioengineering

- Mixed techniques

Soil bioengineering for riverbank protection is defined as the inclusion of vegetation into engineering design to protect riverbanks from erosion and other shallow slope failure (Clark et Hellin 1996, Schiechtl et Stern 1996)

<figure><img src="image_3.png" /></figure>

S. De Danieli (Irstea)
# Introduction

Riparian vegetation on riverbanks : ecological services (for instance, as ecological corridor)

Important biodiversity compared to their area, natural phenomena of erosion

But human issues imply to control bank erosion

Three types of works on riverbanks :

- Civil engineering

- Soil bioengineering

- Mixed techniques

Soil bioengineering for riverbank protection is defined as the inclusion of vegetation into engineering design to protect riverbanks from erosion and other shallow slope failure (Clark et Hellin 1996, Schiechtl et Stern 1996)

<figure><img src="image_4.png" /></figure>

S. De Danieli (Irstea)
# Why a database on soil bioengineering operations ?

* Lack of knowledge : obstacle to the development of bioengineering techniques
Why a database on soil bioengineering operations ?

- Lack of knowledge : obstacle to the development of bioengineering techniques

- No specific database about bioengineering structures with very detailed information on techniques used
# Why a database on soil bioengineering operations ?

* Lack of knowledge : obstacle to the development of bioengineering techniques

* No specific database about bioengineering structures with very detailed information on techniques used

* Two goals for the project GeniVeg :

- to enable managers to know what type of bioengineering constructions are located near them;

- to collect data for scientific purposes.
# Why a database on soil bioengineering operations ?

* Lack of knowledge : obstacle to the development of bioengineering techniques

* No specific database about bioengineering structures with very detailed information on techniques used

* Two goals for the project GeniVeg :

- to enable managers to know what type of bioengineering constructions are located near them;

- to collect data for scientific purposes.

Objective of our first study : first study of the database about hydromorphological variables in the aim to develop soil bioengineering techniques on rivers in harder conditions
<figure><img src="image_5.png" /><figcaption>SQL structure of the database</figcaption></figure>
Free access to inform managers and the public

Prototype available online on [https://genibiodiv.irstea.fr/en/database-of-french-constructions/](https://genibiodiv.irstea.fr/en/database-of-french-constructions/)
(French and English versions available)

New structures regularly uploaded
Free access to inform managers and the public

Prototype available online on https://genibiodiv.irstea.fr/en/database-of-french-constructions/
(French and English versions available)

New structures regularly uploaded

Dynamic map to see the data

Possibility to download PDF files for each structures for more details

<figure><img src="image_6.png" /></figure>
# Presentation of the database

## Definition of an operation :

- Unsegmented worked riverbank with only one technique at the bottom and one or more techniques in the middle and/or the top of the bank
# Presentation of the database

## Definition of an operation :

- Unsegmented worked riverbank with only one technique at the bottom and one or more techniques in the middle and/or the top of the bank

<figure><img src="image_7.png" /></figure>
# Presentation of the database

## Definition of an operation :

- Unsegmented worked riverbank with only one technique at the bottom and one or more techniques in the middle and/or the top of the bank

<figure><img src="image_8.png" /></figure>
Studied techniques

<figure><img src="image_9.png" /><figcaption>Fascine (FAS)</figcaption></figure>
Studied techniques

<figure><img src="image_10.png" /><figcaption>Fascine (FAS)</figcaption></figure>

<figure><img src="image_11.png" /><figcaption>Wattle fence (WAF)</figcaption></figure>
Studied techniques

<figure><img src="image_12.png" /><figcaption>Fascine (FAS)</figcaption></figure>

<figure><img src="image_13.png" /><figcaption>Wattle fence (WAF)</figcaption></figure>

<figure><img src="image_14.png" /><figcaption>Cribwall (CRI)</figcaption></figure>
Studied techniques

<figure><img src="image_15.png" /><figcaption>Fascine (FAS)</figcaption></figure>

<figure><img src="image_16.png" /><figcaption>Wattle fence (WAT)</figcaption></figure>

<figure><img src="image_17.png" /><figcaption>S. De Danieli (Irstea)</figcaption></figure>

<figure><img src="image_18.png" /><figcaption>A. Evette (Irstea)</figcaption></figure>

<caption>Riprap (RIR)</caption>
Studied techniques

<figure><img src="image_19.png" /><figcaption>Fascine (FAS)</figcaption></figure>

<figure><img src="image_20.png" /><figcaption>Wattle fence (WAT)</figcaption></figure>

<figure><img src="image_21.png" /><figcaption>S. De Danieli (Irstea)</figcaption></figure>

<figure><img src="image_22.png" /><figcaption>A. Evette (Irstea)</figcaption></figure>

<figure><img src="image_23.png" /><figcaption>Syndicat Mixte de Restauration des Rivières de la Haute Rouvre</figcaption></figure>

<caption>Comb (CMB)</caption>
# Sample and variables for our study

- 267 operations in France

<figure><img src="image_24.png" /></figure>
# Sample and variables for our study

- 267 operations in France

<figure><img src="image_25.png" /></figure>

- Hydromorphological variables :
  river slope,
  river width,
  position in the meander

- Variable considered :
  the technique at the bottom of the bank
Hill and Smith analysis

<figure><img src="image_26.png" /></figure>
<figure><img src="image_27.png" /><figcaption>River width</figcaption></figure>
River width

Civil engineering

Soil bioengineering

<figure><img src="image_28.png" /></figure>
River slope

<figure><img src="image_29.png" /></figure>
River slope

« Hard » engineering « Soft » engineering

<figure><img src="image_30.png" /></figure>
Discussion and perspectives

- Riprap in harder conditions than the others techniques : more slope and wider rivers
Discussion and perspectives

- Riprap in harder conditions than the others techniques : more slope and wider rivers

- Cribwall on rivers with important slope
Discussion and perspectives

- Riprap in harder conditions than the others techniques : more slope and wider rivers

- Cribwall on rivers with important slope

- Comb for narrow rivers with lower slope
Thank you for your attention !

Any questions ?

<figure><img src="image_31.png" /><figcaption>C. Delage (Irstea)</figcaption></figure>

<figure><img src="image_32.png" /><figcaption>S. De Danieli (Irstea)</figcaption></figure>