A long time ago...
Five thousand years ago, the average sea level rise reached a comparable level to that at the beginning of the 20th century. The Flemish coast naturally evolves towards a dynamic equilibrium between two states, one in which the tidal influence is weak enough for a peat landscape to develop, and one in which the sea can penetrate further inland via large tidal channels.
There is little evidence for any meaningful human activity in the Flemish coastal region up to about 2,500 years ago. From the Iron Age onwards, the human presence in this coastal landscape becomes tangible. Around the same time, the tidal channel separating the Testerep peninsula from the mainland may have come into existence. This channel was connected to the river Yzer in the west and ended in a sand flat (submerged at high tide) near present-day Ostend in the east.
A reconstructive map of Testerep. ©VLIZ
During Roman times, peat and salt were extracted in the area and we see the first indications of dike building. Rising sea levels and the collapse of the Roman economy subsequently degraded this coastal landscape, which once again came under the influence of the tides. During the early Middle Ages, sheep farmers gradually resettled in the slowly accreting salt marsh area.
From the year 1000 onwards humans systematically reduced the influence of the sea by constructing dikes. The Testerep channel was eventually dammed and reclaimed as well, in an effort to intensify the exploitation of these wetlands. New settlements - fishing villages like Walraversijde and trading towns like Ostend - were founded. Their residents however were not safe from the rising sea levels. Severe storms and coastal erosion took their toll, leading for example to the flooding and destruction of medieval Ostend which had to be abandoned and resettled further inland.
A map the area where Testerep used to be located. ©VLIZ
Increasing investments in coastal defenses from the 17th century onward, and the hardening of the coastline with beachheads and dikes since the 19th century – a practice which was maintained until the 1980s – prevented the coastline from shifting any further inland. Recent decades now see a shift towards 'softer' and more sustainable coastal defenses.
The present-day coastline is therefore a snapshot. Natural phenomena and human interventions have caused continuous changes to the coastal landscape over the past millennia. This will be no different in the coming decades, on the contrary: climate change and more rapidly rising sea levels will impact the appearance of the coast. The precarious future of this fragile landscape makes it necessary to thoroughly understand the interaction between man and nature in the past.
In this summary video, the VUB (Multidisciplinary Archaeological Research Institute) and VLIZ (Seascapes Past and Future) outline the historical context of the Testerep peninsula, explain the scientific research conducted in previous studies and indicate the research objectives of the project. (The video is only available in Dutch).