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Strategic placement of dredged sediment in Louisiana’s Atchafalaya River has helped create an island spanning about 35 hectares, turning material removed from the river into a growing landform. The project began in 2002 near Horseshoe Bend, where engineers placed between 0.5 million and 1.8 million cubic yards of dredged sediment at a mid river site every one to three years. Over time the deposited material was reshaped by natural river processes contributing to the formation and expansion of Horseshoe Island. The project was part of an Engineering With Nature approach that sought to combine river management with environmental benefits. As the island grew it reduced the river’s cross sectional area and increased water flow through the navigation channel helping reduce sediment buildu...

  Forests may lose their ability to absorb carbon dioxide during severe droughts as trees close their leaf pores to conserve water according to researchers. Trees absorb CO₂ through tiny openings called stomata while releasing water through the same pores. On average, around 400 water molecules are released for every molecule of CO₂ absorbed during this process. During drought declining soil moisture and rising atmospheric dryness force trees to close their stomata. This reduces photosynthesis and limits the amount of CO₂ forests can absorb. Severe water stress can also damage trees’ internal water transport systems. Air bubbles can form inside the vessels that carry water from roots to leaves, blocking the flow and potentially causing irreversible damage and tree death. ...

Residents of Tulshi village in Maharashtra’s Solapur district have put up a symbolic ‘Village for Sale, Price: Water’ board to protest a years long water shortage. The village home to around 7,000 people, is facing severe water scarcity, with farms wells and 14 ponds reported to have dried up. Residents said they are dependent on water tankers for their needs. Villagers have blamed delays in excavation work under the Sina Madha Lift Irrigation Scheme. According to the village sarpanch, around 800 metres of excavation near the seventh and eighth outlets has remained incomplete for 26 years, despite the canals passing close to the village. Residents began a hunger strike on September 14 and later staged a ‘thali-naad’ protest outside the Madha tehsil office. They have warned of inte...

Researchers at Hunan University of Technology in China have found that changing the way air is injected into underground compressed air energy storage (CAES) caverns can improve storage performance. The team developed a numerical model to study how airflow patterns wellbore size and surrounding rock properties affect temperature, pressure and heat loss inside storage caverns. The model was also validated using operating data from Germany’s Huntorf CAES facility. Researchers compared four injection strategies while storing the same amount of air over eight hours. The approach that gradually increased the airflow from 10 kg/s to 150 kg/s delivered an energy storage rate of 87.5%, compared with 85.5% for a constant 80 kg/s flow. The increasing flow method also raised the average cave...

A small autonomous underwater robot developed by the Woods Hole Oceanographic Institution has helped scientists identify areas of unusually high biological activity on coral reefs. The robot called CUREE (Curious Underwater Robot for Ecosystem Exploration), combines cameras with hydrophones to detect and locate marine life through both visual observations and underwater sounds. During field trials at Joel’s Shoal in the US Virgin Islands between 2022 and 2024, CUREE repeatedly identified a biological hotspot around a large pillar coral structure. Visual surveys found that fish densities near the structure were nearly 25 times higher than elsewhere on the reef. The robot was also able to track biological sounds from distances of up to 80 metres in controlled experiments. Researcher...

Scientists at ETH Zurich in Switzerland have developed a chemical recycling method that can break down acrylic glass or PMMA, into its original monomer at temperatures below 200°C. PMMA is widely used in products such as plexiglass and Perspex because it is lightweight and resistant to shattering. However, conventional recycling methods generally require temperatures above 400°C and may use solvents, making the process more energy-intensive and potentially affecting the quality of the recovered material. The new technique uses a chemical reaction involving an N-hydroxyimide reagent to split the PMMA polymer chain. One of the resulting fragments can then rapidly break down into its monomer which can be used to produce new acrylic material. In laboratory experiments, the process ach...

  A district in the Swedish city of Helsingborg is using a wastewater separation system to recover water, energy and nutrients offering a model for improving water security amid rising climate pressures. In the Oceanhamnen district, wastewater is divided into three separate streams. Toilet waste, or blackwater is collected through one pipeline while greywater from showers, sinks, laundry and dishwashers travels through another. Food waste from kitchen sinks is sent separately for biogas production. The source separation system allows different waste streams to be treated according to their properties. Greywater contains fewer contaminants than blackwater and can be treated for uses such as toilet flushing and irrigation. Helsingborg is also considering using recycled greywate...

A spell of intense rainfall in September has helped reduce India’s overall monsoon rainfall deficit, with the shortfall narrowing to 12% from 14% at the end of August, according to the India Meteorological Department (IMD). September rainfall has so far remained 5% below normal at 152.6 mm. However, unusually heavy rain on September 26, when the country recorded 162% above normal rainfall for the day significantly improved the season’s overall rainfall position. Four meteorological subdivisions recorded more than 1,500% excess rainfall on September 26. West Uttar Pradesh received 3,003% above normal rainfall, followed by east Madhya Pradesh at 1,580%, Chhattisgarh at 1,537% and east Uttar Pradesh at 1,518%. The heavy spell, however, caused severe damage in parts of Uttar Pradesh. ...

  Rising temperatures in the Arctic are causing frozen ground to thaw, creating growing risks for roads, buildings, pipelines and coastal communities built on permafrost. Researchers are now using drones geophysical surveys and digital twin technology to detect these changes and predict future damage. In places such as Wainwright and Utqiaġvik in Alaska, permafrost contains large amounts of ground ice. When that ice melts the soil can lose stability, causing land to sink and infrastructure to tilt, crack or become damaged. Coastal thaw can also accelerate erosion, bringing shorelines closer to homes and roads. Researchers are using drone mounted electromagnetic sensors to examine underground conditions without extensive drilling. The technique can help identify areas where fr...

  New Delhi: Delhi recorded a minimum temperature of 21 degrees Celsius on Tuesday morning, 2.3 degrees below normal, marking the lowest September minimum temperature in the capital since 2008, according to the India Meteorological Department (IMD). The lowest September minimum temperature since 2001 was 20.8 degrees Celsius, recorded on September 6, 2008. On September 19, 2024, the minimum temperature was 21.1 degrees Celsius. Among other weather stations, Palam recorded 19.7 degrees Celsius, while Lodi Road recorded 20.4 degrees Celsius. The Ridge recorded 16.9 degrees Celsius, which was 6 degrees below normal. The IMD forecast the maximum temperature in Delhi to remain around 32 degrees Celsius on Tuesday, with partly cloudy conditions. Delhi Air Quality Index stood ...