TISOLS happened from 17-21 April 2023

On behalf of the Organising Committee, we thank all participant for their contributions to  the 10th International Symposium on Land Subsidence (TISOLS).

The symposium was organised under the auspices of the Unesco IHP Land Subsidence International Initiative (LaSII), and forms the latest edition of a long-standing tradition of international symposia. LaSII has endeavoured to improve and disseminate knowledge on land subsidence since the 1970s, through International Symposia on Land Subsidence, collaborative projects and publications.

Land subsidence, or land-level lowering, is a major problem that threatens the viability and sustainable economic development for millions of people throughout the world, especially in (but not restricted to) highly urbanized coastal areas. It is often a result of overexploitation of groundwater resources. The total costs globally amount up to many billions of dollars annually.

New innovative technologies and approaches are needed to reduce or, in the best case, to stop land subsidence. TISOLS brought together international experts to share the latest research and insights on natural and anthropogenic land-level lowering. Ultimately, we aim to increase the acknowledgement of the land subsidence problem in order to devise targeted strategies and solutions for long-term sustainable living conditions in subsiding areas. At TISOLS we toomk on the challenge that lies in linking hydrological, geotechnical and geological knowledge to policy and socially acceptable solutions.

TISOLS2023 has been held from 17 – 21 April 2023 at the Aula of the Delft University of Technology in Delft in combination with a Subsidence and Society Day in the historical city of Gouda. The city of Delft is well known for its Delft Blue pottery and the cheese from Gouda is world famous. However, both cities are also located in the heart of the subsiding Dutch coastal plain. Subsidence has made the Netherlands to what it is today; a water-rich country which is one third below sea level. The Netherlands are still subsiding, causing damage to infrastructure and buildings. On top of that, land subsidence is worrisome for an already low-lying country that has to cope with sea-level rise.

On behalf of the UNESCO Land Subsidence International Initiative, the TISOLS organizing committee and the TISOLS scientific committee
Gilles Erkens and Peter A. Fokker