After the glacier's recession, the waterlogging predicament is intensifying
Collapse of Swiss Alps Glacier Triggers Evacuations and Rising Flood Risks
In the Lötschental valley of Switzerland, a critical situation has unfolded following the collapse of the Birch Glacier. The incident has destroyed parts of the village of Blatten and ensnared the nearby Lonza river, resulting in the formation of a rapidly rising lake.
According to authorities, the water level in the lake has surged at times by three meters per hour, although the rate has since slowed. Nonetheless, officials expect the ensuing flood could break through the debris pile and overflow in the early morning hours.
Christian Studer of the Natural Hazards Service explained that the aim is to anticipate this process and uphold the safety of the population in the valley. Experts are working around the clock to make predictions using experience and computer models.
Although a massive flood wave sweeping through the valley is thought to be unlikely, it cannot be definitively ruled out. Meanwhile, temperatures of 20 degrees are anticipated in the valley on Friday, which would further melt snow and increase water volumes.
Studer noted that a more probable scenario involves the lake emptying itself gradually, draining in a controlled manner. The relatively flat slope of the debris cone is said to aid this process. Furthermore, it is possible that the water will flush away the deposited material and transport it down the valley. However, authorities expect that not too much debris will be carried away at once.
In the village of Ferden, there is a reservoir and a dam that are expected to halt the transportation of all the material.
The circumstances on the mountain remain dangerous, with a threat of further rockfalls from the Kleines Nesthorn. Alarming rocks fell onto the Birsch glacier, causing it to fracture under the weight and thunder down into the valley on Wednesday afternoon. Large swaths of the debris have been pushed up onto the opposite side of the valley, posing a risk of rockslides.
The Matterhorn-based village of Wiler's representative, Beat Rieder, referred to the event as a century-defining disaster for the valley, describing it as an occurrence that the valley has never experienced throughout its recorded history. Bookings, houses, and personal belongings have been lost, and many have been left with nothing.
Drone imagery depicted that a significant portion of the village of Blatten is buried beneath a meter-high layer of debris, with most initially spared homes now submerged by flooding from the Lonza. An estimated 300 inhabitants were evacuated last week, with one local resident yet to be found.
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Despite attributing a single event directly to climate change being challenging, experts like Jan Beutel of the University of Innsbruck stress that significant alterations in high-altitude regions are largely due to climate change over the past few decades. Warming temperatures have resulted in melting glaciers, faster snowmelt, erosion, and thawing of permafrost, leading to increased water and wind erosion of rock. These factors in combination could exacerbate the risk of future glacier collapses.
In light of the collapsing Birch Glacier in the Lötschental valley, it's crucial for scientists to study the impact of climate change on environmental-science phenomena, such as glacier melt and weather patterns, to predict future risks and mitigate their negative effects. The sudden surge in lake formation following the glacier collapse highlights the urgent need for a deeper understanding of climate-change impacts on the mountainous regions.
