1.2 Coordonnées des personnes-ressources et des institutions impliquées dans l'évaluation et la documentation de la Technologie

Nom du projet qui a facilité la documentation/ l'évaluation de la Technologie (si pertinent)

Book project: Making sense of research for sustainable land management (GLUES)

Nom du projet qui a facilité la documentation/ l'évaluation de la Technologie (si pertinent)

Climate Change - Land Use Strategies (CC-LandStraD / GLUES)

Nom du ou des institutions qui ont facilité la documentation/ l'évaluation de la Technologie (si pertinent)

Thünen Institute (Thünen Institute) - Allemagne

Nom du ou des institutions qui ont facilité la documentation/ l'évaluation de la Technologie (si pertinent)

Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBSR) - Allemagne

1.3 Conditions relatives à l'utilisation par WOCAT des données documentées

Le compilateur et la(les) personne(s) ressource(s) acceptent les conditions relatives à l'utilisation par WOCAT des données documentées:

Oui

1.5 Référence au(x) Questionnaires sur les Approches de GDT (documentées au moyen de WOCAT)

2.1 Courte description de la Technologie

Définition de la Technologie:

A scenario simulation of land use change where high-quality inner urban development is promoted, including the rehabilitation of brownfields, reuse of vacant lots, use of gaps between buildings and the improvement of existing structures.

2.2 Description détaillée de la Technologie

Description:

The best means of reducing land loss by settlement and infrastructure development is through fulfilling inner urban development potential. This “compact settlement development” makes the most efficient use of space. Simultaneously it contributes to the reduction of greenhouse gas emissions by the maintenance of farmland or forest areas on the outskirts of urban areas. One example is the rehabilitation and utilization of “brownfields”, including previous industrial areas. Another example is redevelopment of transportation infrastructure within settlements or on the urban fringe. However, the revitalization and utilization of brownfields is often expensive. Other aspects of inner urban development are the reuse of vacant lots, the use of spaces between buildings and the improvement of existing building structures by adding extra floors.

Purpose of the Technology: Through these developments, the rate of daily land consumption by settlement and transportation can be reduced. In Germany, such land loss reached 73 ha/day in 2010. According to a survey commissioned by the Federal Office for Building and Regional Planning, 20% of existing brownfields and vacant lots can be brought into use in the short term and another 50% of the total in the long term: 30% cannot be developed for various reasons including disputed tenure. The ambitious aim of the sustainability strategy of the German federal government is to reduce today’s daily land consumption for settlement and transport from the current 73 ha/day to 30 ha/day by 2020. However this appears unrealistic: nevertheless with high-quality inner urban development technology, this could be achieved by 2030. If the technology is planned and implemented through scenario simulation of sectoral land use changes in Germany (agriculture, forest and settlements), then calculations show that the daily land loss by settlement and transport could be reduced from 45 ha/day in a “business as usual” scenario (with some improvements assumed) to 30 ha/per day in 2030 by using high-quality inner urban development measures.

Establishment / maintenance activities and inputs: During re-densification of urban areas sufficient green spaces must be protected to address climate change considerations such as higher temperatures and more runoff. High urban densities lead to an increase in the “heat island effect” (a combination of extensive urban/ suburban landscapes with reduced air circulation, little cloud cover and long periods of high temperature). Thus, the rehabilitation of brownfields has to go along with the transformation of impervious surfaces into permeable ones, and planning of corridors for air exchange by “green and blue climate corridors” (public parks, ponds and rivers). There are several initiatives to establish high quality inner urban development in Germany. These include: 1) “Inner before external” urban development within the Federal Building Law; 2) Many communities operating a brownfields and vacant lots cadastre; 3) General management of urban areas. Nevertheless, the reuse of inner city brownfields often requires considerable and costly remediation of contaminated sites. Due to the ownership issues of vacant lots, many are not easily accessible through municipalities, and this complicates their development. In other cases, available construction areas or buildings are not appropriate to the needs of investors.

2.3 Photos de la Technologie

2.5 Pays/ région/ lieux où la Technologie a été appliquée et qui sont couverts par cette évaluation

2.6 Date de mise en œuvre de la Technologie

Si l'année précise est inconnue, indiquez la date approximative: :

• il y a moins de 10 ans (récemment)

2.7 Introduction de la Technologie

Spécifiez comment la Technologie a été introduite: :

• par le biais de projets/ d'interventions extérieures

Commentaires (type de projet, etc.) :

The technology documented here is a scenario simulation of land use change and not the realisation of a specific inner urban development project.

3.2 Type(s) actuel(s) d'utilisation des terres, là où la Technologie est appliquée

Commentaires:

Major land use problems (compiler’s opinion): Land use for settlement and transport leads to imperviousness, and a reduction of high quality agricultural areas. Sealed surfaces increase runoff during heavy rain events, and high building densities promote the development of urban heat islands.

Major land use problems (land users’ perception): In fast-growing regions, high demand requires the supply of additional land for construction.

Future (final) land use (after implementation of SLM Technology): Other: Oo: Other: wastelands, deserts, glaciers, swamps, recreation areas, etc

Type of cropping system and major crops comments: not applicable

Constraints of settlement / urban: Data availability for locations of brownfields, vacant lots and vacancies

Constraints of infrastructure network (roads, railways, pipe lines, power lines): Data availability for locations of brownfields, vacant lots and vacancies

Constraints of recreation: Data availability for locations of brownfields, vacant lots and vacancies

Constraints of brownfields: Data availability for locations of brownfields, vacant lots and vacancies

Number of growing seasons per year: 1

3.3 Est-ce que l’utilisation des terres a changé en raison de la mise en œuvre de la Technologie ?

Est-ce que l’utilisation des terres a changé en raison de la mise en œuvre de la Technologie ?

• Non (Passez à la question 3.4)

Commentaires:

Other: Os: Settlements, infrastructure networks

3.5 Groupe de GDT auquel appartient la Technologie

• Compact settlement development

3.6 Mesures de GDT constituant la Technologie

Commentaires:

Main measures: management measures

3.7 Principaux types de dégradation des terres traités par la Technologie

Commentaires:

Main type of degradation addressed: Pu: loss of bio-productive function due to other activities

Secondary types of degradation addressed: Pk: sealing and crusting, Bh: loss of habitats, Bq: quantity / biomass decline

Main causes of degradation: urbanisation and infrastructure development

Secondary causes of degradation: population pressure, inputs and infrastructure: (roads, markets, distribution of water points, other, …), governance / institutional

3.8 Prévention, réduction de la dégradation ou réhabilitation des terres dégradées

Spécifiez l'objectif de la Technologie au regard de la dégradation des terres:

• réduire la dégradation des terres

Commentaires:

Main goals: mitigation / reduction of land degradation

4.1 Dessin technique de la Technologie

4.3 Activités de mise en place/ d'établissement

	Activité	Calendrier des activités (saisonnier)
1.	Data collection	Half a year
2.	Implementation into the model and model calibration	Half a year
3.	Model runs	one month
4.	Evaluation	one month
5.	Scenario development

4.7 Facteurs les plus importants affectant les coûts

Décrivez les facteurs les plus importants affectant les coûts :

Measures can be very different in terms of inputs and costs, and depend on the specific situation eg contaminated area of a former petrol station can have very high rehabilitation costs due to the need to detoxify the soil before new use. However other measures cost (effectively) no money at all eg legislation governing the reduction of the distance permitted between two new buildings by the local authorities.

5.1 Climat

5.2 Topographie

Commentaires et précisions supplémentaires sur la topographie:

Landforms: plateau / plains, hill slopes, valley floors (Not relevant for technology inner urban development)

5.6 Caractéristiques des exploitants des terres appliquant la Technologie

Indiquez toute autre caractéristique pertinente des exploitants des terres:

Difference in the involvement of women and men: Technology is not applied by land users. The technology is a scenario simulation, not a specific project of inner urban development.

Population density: 200-500 persons/km2

Annual population growth: < 0.5%

(Technology, which is a scenario simulation is not applied by land users.).

Off-farm income specification: not applicable

5.8 Propriété foncière, droits d’utilisation des terres et de l'eau

Droits d’utilisation des terres:

• communautaire (organisé)
• individuel

Commentaires:

Land ownership: state, company, individual, not titled

6.1 Impacts sur site que la Technologie a montrés

Impacts socioculturels

Impacts écologiques

Cycle de l'eau/ ruissellement

Sols

Biodiversité: végétale, animale

Réduction des risques de catastrophe et des risques climatiques

Autres impacts écologiques

6.2 Impacts hors site que la Technologie a montrés

6.3 Exposition et sensibilité de la Technologie aux changements progressifs et aux évènements extrêmes/catastrophes liés au climat (telles que perçues par les exploitants des terres)

Changements climatiques progressifs

Changements climatiques progressifs

	Saison	Augmentation ou diminution	Comment la Technologie fait-elle face à cela?
températures annuelles		augmente	pas bien

Extrêmes climatiques (catastrophes)

Catastrophes météorologiques

	Comment la Technologie fait-elle face à cela?
pluie torrentielle locale	pas bien
tempête de vent locale	pas connu

Catastrophes climatiques

	Comment la Technologie fait-elle face à cela?
sécheresse	pas connu

Catastrophes hydrologiques

	Comment la Technologie fait-elle face à cela?
inondation générale (rivière)	pas connu

Autres conséquences liées au climat

Autres conséquences liées au climat

	Comment la Technologie fait-elle face à cela?
réduction de la période de croissance	bien
	pas connu

Commentaires:

A more intensive use of urban area through inner urban development leads also to an increase of impervious areas. These can addressed by urban blue and green corridors.

6.5 Adoption de la Technologie

Commentaires:

No answer possible, since technology is a scenario simulation.
There is no trend towards spontaneous adoption of the Technology

6.7 Points forts/ avantages/ possibilités de la Technologie

Points forts/ avantages/ possibilités du point de vue du compilateur ou d'une autre personne ressource clé
Scenario simulations help to identify hot spots and can indicate regions where inner urban development should be pushed by public institutions. How can they be sustained / enhanced? Inner urban development is profitable if pressure on land is high but needs to be pushed also in regions with less pressure to protect soils, nature and climate.
Inner urban development can have positive impacts on climate adaptation How can they be sustained / enhanced? To reach positive impacts on climate adaptation issues it is necessary to establish green and blue climate corridors (e.g. network of urban greens established or optimized by re-vitalization of brownfields).
Inner urban development can rise the attractiveness of town (greater inner city mobility, compact town) How can they be sustained / enhanced? The technology improves inner-urban area development. For improvements to existing settlement areas, additional building activities (e.g. making buildings taller; concentrating housing) are possible. Side effects are a very concentrated settlement structure but with the advantage of reducing the sprawling out of settlements into agricultural land or wooded areas (i.e. outer development) and this saves GHG emissions and other ecosystem services ESS.

6.8 Faiblesses/ inconvénients/ risques de la Technologie et moyens de les surmonter

Faiblesses/ inconvénients/ risques du point de vue du compilateur ou d'une autre personne ressource clé	Comment peuvent-ils être surmontés?
Nationwide simulation cannot indicate concrete lots where inner urban development should be pushed.	The technology has shown the potential for Germany as a whole, but implementation depends on local authorities.

7.1 Méthodes/ sources d'information

7.2 Références des publications disponibles

Titre, auteur, année, ISBN:

www.cc-landstrad.de

Titre, auteur, année, ISBN:

www.bbsr.bund.de

7.3 Liens vers les informations pertinentes en ligne

Titre/ description:

www.cc-landstrad.de

Titre/ description:

www.bbsr.bund.de