Reuters reported the prehistoric stone circle is now visible for the fourth time since the area was flooded in 1963 as part of a rural development project. Many are familiar with Stonehenge in the U.K., but the recent drought has once again revealed the so-called “Spanish Stonehenge” in the Valdecanas reservoir, located in western Spain. Spain’s drought began early in the year after the country suffered its second driest winter in more than 60 years, according to the government. Spanish ‘Stonehenge‘ People stand next to the Dolmen of Guadalperal, a megalithic monument that emerged due to drought at the Valdecanas reservoir in El Gordo, western Spain. NPR reported a hunger stone was visible in Děčín in 2018 during a separate drought and heat wave, and many additional hunger stones exist throughout the region. The recent drought isn’t the first time such inscriptions have been visible in recent years. This particular hunger stone was found near the town of Děčín, located in the northern region of the Czech Republic close to the country’s border with Germany.
The inscription was written as a famine warning to future generations. The phrase translates to “If you see me, then weep.” The levels have threatened shipping, especially in the Serbian section of the river, where officials have begun dredging to keep vessels moving through the waterway. The drought has brought the Danube River, the second-longest in Europe, to some of the lowest water levels seen in nearly a century. and across the globe, here are five of the weirdest things exposed by lakes and rivers that are drying up: Nazi warships Nearly half our Europe is facing drought warnings, while dry conditions in the American West, the worst in more than 1,000 years, led to water allocation cutbacks last week for states along the Colorado River.Īn EU-commissioned report from the Global Drought Observatory released this month found that 47 percent of Europe is in drought warning conditions, and 17 percent of the region meets the threshold for alert conditions.Īs policymakers bring new urgency to addressing droughts in the U.S. We can use our approach to recommend the best possible setup with the highest accuracy for a given location or area.( The Hill) – Falling water levels in lakes and rivers across the globe have caused great concern among climate experts, and they have also led people to stumble upon a range of newly uncovered relics, from sunken ships to human remains. “Each urban environment is too individual (e.g., in terms of layout, building types, vegetation) to make a general recommendation for a sensor set up,” said Still. Adding more sensors increased the accuracy but had diminishing returns after a certain point. The smaller the distance between the shooting line and a sensor, the more accurate they could be with their prediction of the source. The localization accuracy depended significantly on the sensor-to-shooter geometry and the shooting direction with respect to the sensor network.
The group compared their accuracy prediction to experimental performance under various geometries, weapons, and sensor types. “The smaller the ellipse-shaped area, the higher the expected localization accuracy.” “In our approach, the prediction can be interpreted as an ellipse-shaped area around the true shooter location,” said Still. This modeling, combined with information on sensor characteristics, the sensor-to-shooter geometry, and the urban environment, allowed them to calculate a prediction of localization accuracy.
Still and her team used geometric considerations to model acoustic sensor measurements. Preemptively predicting this accuracy is crucial for mission planning in urban environments, because it can inform the necessary number of sensors and their requirements and positions. The combination of these effects can severely impact the accuracy of shooter localization. In an urban setting, buildings or other obstacles can reflect, refract, and absorb sound waves.
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