15 th SAG Workshop

on Tuesday, 25 th of September 2018 in Bremen


Pulling tests on leaning trees

– implications and problems with pulling tests and their evaluations –

This workshop will focus on the joint measuring of leaning trees with pulling tests. We intend to test 5 trees in different directions, analyze data and discuss the evaluation.

Caution: the preparations for the workshop will start on Monday 24.9.2018 at 5:00 pm after the AGM of SAG Baumstatik e.V.

language German and English, translations possible
time introduction/preparations: Monday, 24.09.2018, 5:00 – 6:30 pm
Workshop: Tuesday 25.9.2018, 8:30 am to 5:00 pm
location Schweizerhaus in the Bürgerpark, Bremen, Germany
fee SAG-members lunch paid individually
non-members 225,- € plus VAT
rooms – B&B Hotel Bremen-Hbf, Findorffstraße 28-32, 28215 Bremen
Tel. +49 (0)421 / 619580, E-Mail: bremen-hbf@hotelbb.com
– prizeotel Bremen-City, Theodor-Heuss-Allee 12, 28215 Bremen
Tel. +49 (0)421 / 59 49 94 01, E-Mail: hello@prizeotel.com
registration workshops@sag-baumstatik.org until 10. September 2018


We are looking forward to meeting you in Bremen.

The board


Please note:
On the previous day, Monday, 24 th of September 2018, the Annual General Meeting of SAG Baumstatik e.V. will take place in the same venue. Please register for this meeting if you like. The meeting will start at 2 pm and end at 5 pm.



Monday, 24.9.2018

5:00 pm preparation, presentation protocol for measurements, group formation
In Schweizer Haus, Bürgerpark Bremen (participation not mandatory)
7:00 pm joint dinner in the restaurant La Rucola
Neukirchstraße 1, 28215 Bremen (table reserved for SAG)


Tuesday, 25.9.2018

8:30 am meeting in the Bürgerpark Bremen, Schweizer Haus
Measurements on trees in the Bürgerpark in 5 groups
12:30 am joint lunch
2:00 pm presentations by B. Heilmann, A. Detter
3:30 pm coffee break
4:00 pm discussion and analysis of data
5:00 pm end of workshop


how to get there:

14th SAG Workshop

The 14th Workshop of SAG Baumstatik has take place on 26th of February 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 WorkshopWorkshop



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.

language: Italian, English
time: Monday, 9.10.2016, 9:00 am to 4:30 pm
location: Sala Imbarcadero 2 – Castello Estense – Piazza Castello – Ferrara
fees: SAG-members 35.- € for food & beverages
non-members 245.- € plus VAT
early bird 180.- € plus VAT registration before Sept. 9 th
rooms: 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, www.hoteleuropaferrara.com
registration: a.akontz@tree-consult.org or phone +49-89-752150

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.

language English, translations to and from French and German on request
time Tuesday, 4.10.2016, 8:30 am to 5:30 pm
location INRA Centre de Nancy, Rue d’Amance,
54280 Champenoux, France
building and room number to be announced
fees SAG-members only for food and drinks
non-members 245.- € plus VAT
rooms QuickPalace
midway between Nancy and INRA,Ibis

www.hotel-stanislas.fr/ in Nancy

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


Download the Invitation with detailed PDF-Program.

11. SAG Workshop

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 Einladung mit genauen Details als PDF.

10th SAG Workshop

Ancient Tree Managemnet

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

9th SAG Workshop

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


Prof. Bert Blocken