Is it possible to preserve the Ihlara Valley cultural and natural heritage?

The Ihlara Valley in the heart of Cappadocia, Türkiye, captivates visitors with its ancient dwellings and churches carved into rock. However, the valley's beautiful Kizilkaya ignimbrite cliffs are vulnerable to secondary toppling failures.
Is it possible to preserve the Ihlara Valley cultural and natural heritage?
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Secondary toppling failure analysis and optimal support design for ignimbrites in the Ihlara Valley (Cappadocia, Turkey) by finite element method (FEM) - Geotechnical and Geological Engineering

Kizilkaya ignimbrite, characterized by a blocky structure in the Ihlara Valley (Cappadocia, Turkey), poses many hazards to visitors and the human-made churches and dwellings carved in the valley slopes. The instability mechanism in the valley should be carefully investigated to determine and implement a suitable prevention method. For this purpose, the finite element method (FEM) models were developed in RS2 software to illustrate the problem of progressive failure in the valley’s cliffs. A simple geometry represented the rock strata and its surroundings. The effect of columnar structure on the cliff stability was mimicked as a jointed medium in two-dimensional numerical models. The results of FEM models revealed that as the stage of failure progresses in the slope, the strength reduction factor decreased subsequently from 2.05 to 0.45. These models correctly captured the prevailing failure mechanisms observed in the valley slopes. Depending on the size of the rock blocks described in the FEM analysis, an effective support system was proposed to remedy the slope failure. It was found that fully bonded rock bolts with a length of at least 2.5 times the width of a typical block should be implemented with a certain grid pattern. The study clearly showed that it was promising to realize a numerical solution to secondary toppling failure in a jointed rock mass using the FEM.

Fig. 1. A scenic view of the Ihlara Valley

Ihlara Valley, nestled in the heart of Cappadocia (Fig. 1), Türkiye, is renowned for its unique geological formations. However, the region faces a series of significant natural challenges that threaten its stability and cultural heritage.

Rock instability and erosion

The valley is formed by volcanic rocks such as ignimbrite, ash, and tuff, which are vulnerable to erosion caused by wind, rain, and temperature fluctuations. Over time, these natural forces have weakened the rock structures, threatening both natural landscapes and historical sites.

Climate change

Rising temperatures and changing precipitation patterns are altering the ecosystem of the region. These shifts can accelerate erosion, and alter the seasonal flow of water.

Natural and man-made seismicity

It is expected that possible triggering factors will be effective on the block instability. Therefore, it is important to monitor ground vibrations caused by earthquakes and man-made interventions.

Solution

Slope stability monitoring near cultural heritage sites is critical to prevent potential failures that could threaten the site's safety and preservation. By implementing a monitoring system with alarm thresholds, early signs of instability can be detected, and timely action can be taken to mitigate risks.

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