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14th SAG Workshop


The 14th Workshop of SAG Baumstatik has take place on 26th of Febraury 2018. In Gauting, almost 40 participants met from 10 countries, from Canada to Croatia, from Britain to Italy.


The focus was on recent findings from research in tree statics at unviversities. Presentations were held with the follwoing contents:


  • Winching tests on Poplar trees on water saturated soils (J. Böttcher)
  • Winching tests on the stability of dead Spruce trees (R. Schröder)
  • Winching tests on the stability of forest Spruce trees (O. Krišāns, Riga)
  • The influence of the geometry on tomography (Prof. S. Rust)
  • Using infra-red markers for optical monitoring of pulling tests (K. Wiegmann)
  • Spectral and wavelet analysis of tilt measurements in natural winds (L. Hoffmann)
  • Correlating pulling tests and tilt measurements in natural winds to calibrate wind load assessments (D. Esche, P. Schuhmacher)

The results will be available in a summarized format shortly on this website. We would like to thank everybody for sharing their results and the fruitful discussions.



the participants of the 14th SAG Workshop

Invitation to the annual  

General Meeting (GM)

of SAG Baumstatik e.V.
in Ferrara, Italy,10.10.2017

Dear colleagues,
We would like to invite all members to the annual general meeting in 2017.
Venue: Ferrara, Italy (further informations will follow)
The day before the meeting, we will run the 13th SAG workshop at the same venue.

We have provided the following agenda

9:00 am – 10:30 am
1. Organizational issues of the association
     1.1 Report of the Board (activities since the last GM)
     1.2 Treasurer's Report
     1.3 New workshops planned in 2018 and 2019
     1.4 New election of the board
           There are in the moment 5 candidates for the four places in the board:
           Michael Schlag, Andreas Detter, Klaus Schöpe, Stefania Gasperini, Michiel Mol.
           More candidatures are possible.
           The votes procedure will be presented on the GM
10:30 am – 11:00 am coffee break
11:00 am – 12:30 am
2. Memberships
     2.1 Members and former members
     2.2 Applications for membership
3. Reports from work groups
     3.1  discussion and voting on potential research projects etc
     3.2  Presentation of a directive for safety during pulling tests etc
4. Completion
     4.1 Next Meeting
     4.2 Other
We hope to see all of you.
With best regards on behalf of the Board
Edewecht/Gauting/Köln, 28.06.2017                                            Klaus Schöpe



13th  SAG Workshop

on October 9 th  2017 in Ferrara, Italy

Tree Architecture and Morphophysiology   

The shape of trees is the dynamic result of the continuous interaction of every individual tree with the context, even physical, that surrounds it. Tree architecture is the discipline  that, defining the principles underlying such interaction, allows to reconstruct the past of a tree, to understand its present and to predict its future evolution.
Through tree morphophysiology it is also possible to relate the architecture of a tree with its biological and functional characteristics, defining the morphological and anatomical relationships that connect the different parts of it. In this way it is possible, for example, to infer the root system organization from the characteristics of the tree's canopy. 
Similarly,  it  is  possible  to  identify  any  energetic,  hormonal  or  structural  alterations, because  the  tree  architecture  would  show  the  consequences  of  them,  or  you  can evaluate the importance of some symptoms, such as cavities, depending on the indi-
vidual evolution of a tree.
Although the principles of tree architecture and morphophysiology have been studied for more than thirty years, their use at diagnostic and application levels is still very limited. The presentation, from a practical point of view, intends to contribute to highlight this subject.

Dr Giovanni Morelli, agronomist and arborist, owner of Progetto Verde since 1994, is a consultant in in urban arboriculture, specialized in tree risk and tree stability assessment. He has written numerous articles and he is a lecturer in university courses. He has been speaker at more than 60 national and international conferences or seminars. He is a member of the ISA International Society of Arboriculture (ISA), of the SIA (Società Italiana di Arboricoltura), and of SAG Baumstatik e.V.. He is ISA Certified Arborist, ETT - European Tree Technician, Board Certified Master Arborist (ISA) and TRAQ (Tree Risk Assessment Qualification).
The presentation will be held in English language. Translations of questions from English to German or Italian will available upon request.

8:30 – 8:45

Opening, registration

8:45 – 9:00

Welcome, introduction

9:00 – 10:20

Giovanni Morelli: Tree Architecture

10:20 – 10:40

Coffée break

10:40 – 12:15

Giovanni Morelli: Tree Morphophysiology

12:15 – 12:45

Question time

12:45 – 13:30

Lunch break

13:45 – 15:45

Observation of tree architecture in Massari Park

16:00 – 16:30

General discussion, end

On the following day, October 10 th , the Annual General Meeting of SAG Baumstatik will take place in the same venue. The AGM is not open to the public.


Italian, English


Monday, 9.10.2016, 9:00 am to 4:30 pm


Sala Imbarcadero 2 – Castello Estense – Piazza Castello – Ferrara


SAG-members      35.- € for food & beverages
non-members    245.- € plus VAT 
early bird           180.- € plus VAT registration before Sept. 9 th


Hotel  Europa,  Corso  della  Giovecca,  49,  44121  Ferrara, 
we reserved 20 rooms for SAG workshop participants until the 8 th  of
September with special prices,  


Öffnet ein Fenster zum Versenden der E-Maila.akontz(at) or phone +49-89-752150

Here the Leitet Herunterladen der Datei einRegistration-Form as PDF.


12th  SAG Workshop

on October 4 th  2016 in Nancy, France




Advances in biomechanics and mechanobiology for the diagnostic of urban trees

Over  the  last  3  decades,  the  biomechanical  inputs  for  the  analysis  of  urban  trees have been largely developed, starting with the seminal works of Lothar Wessolly and Klaus Mattheck. As a consequence, leading experts in the diagnostic of mechanical stability and safety of urban trees are now using techniques of biomechanical engineering such as model of static wind loads on trees and/or static tension-flexion tests. 
We would like to make an update and to share ideas with arboriculture experts about novel  findings  from  the  biomechanics  and  mechanobiology  research  along  3  lines directly related to tree safety: crown reconfiguration in wind, dynamics and compartmentalization of mechanical energy, long term acclimation of trees (see program). 
The following exchange between scientists and expert will be on i) how to improve current biomechanical tools for the mechanical analysis of trees and ii) how we may change from punctual diagnosis to longitudinal monitoring and long-term diagnosis.


English, translations to and from French and German on request


     Tuesday, 4.10.2016, 8:30 am to 5:30 pm


INRA Centre de Nancy, Rue d'Amance,
54280 Champenoux, France
building and room number to be announced


          SAG-members    only for food and drinks
          non-members    245.- € plus VAT


      Öffnet externen Link in neuem 
      midway  between  Nancy  and  INRA, 

      Öffnet externen Link in neuem

      Öffnet externen Link in neuem in Nancy


Öffnet ein Fenster zum Versenden der E-Maila.akontz(at)
or phone +49-89-752150


Download the Initiates file downloadInvitation with detailed PDF-Program.


[Translate to English:] Kommender Workshop:

"Messungen im natürlichen Wind - Einsatzmöglichkeiten für die Beurteilung der Verkehrssicherheit"

am Montag, den 9.5.2016 wird der nächste SAG-Workshop stattfinden.
In Gauting werden wir uns mit dem Thema "Messungen im natürlichen Wind - Einsatzmöglichkeiten für die Beurteilung der Verkehrssicherheit" beschäftigen.

Hier die Leitet Herunterladen der Datei einEinladung mit genauen Details als PDF.



10th workshop


Ancient Tree Managemnet



will be on the 19th and 20th of October 2015 in Gauting near München
















our next, the 9th workshop will be on the 2nd of march 2015 in strassbourg (INSTALLATIONS IN TREES)


The Annual General Meeting will take place on the following day (3rd of March 2015)


More informations and the online-registration will be published at the begin of January 2015.










Workshop 29./30. April 2015 in Eindhoven

Öffnet externen Link in neuem Fenster"WIND ON BUILDINGS AND CITIES"

Prof. Bert Blocken




PDFs of all Invitations, Workshops and Meetings


In the following list you find our Archives in PDF-File Format.


Initiates file downloadrecent research-programm.pdf

170 KB


Initiates file downloadTree achitecture SAG Workshop.pdf

174 KB


Initiates file downloadbiomechanics Nancy-programm.pdf

261 KB


Initiates file downloadwindwackeln-programm.pdf

149 KB


Initiates file downloadneville fay_gauting.pdf

180 KB


Initiates file downloadinstallations-strasbourg.pdf

181 KB


Initiates file downloadberz-gauting.pdf

98 KB


Initiates file downloadruck-karlsruhe.pdf

857 KB


Initiates file downloadroloff_gauting.pdf

107 KB


Initiates file downloadspatz_gauting.pdf

107 KB


Initiates file downloadFailure Tests.pdf

89 KB


Initiates file downloadken_james.pdf

88 KB