Oroville Dam crisis (original) (raw)
- أزمة سد أوروفيل 2017 (بالإنجليزية: 2017 Oroville Dam crisis) شكلت تهديدا كبيرا ومستمرا على الأرواح والممتلكات في شمال كاليفورنيا. يبلغ ارتفاع سد أوروفيل 770 قدم (235 م)، يُعد أطول سد في الولايات المتحدة. ويقع في مقاطعة بوت حوالي 70 ميل (110 كـم) شمال سكرامنتو، السد كّون ، ويتحكم في تدفق . في أوائل فبراير 2017، تسببت العواصف بأضرار جسيمة في اقنية السد، مما أعاق الإفراج الآمن عن فيضان المياه، وأدى إلى فيضان مياه غير متحكم به من بحيرة السد إلى مفيض طواري السد ونتيجة لقوة تيار الماء المنساب مع مفيض الطواري تشكلت حفرة في أرضية المفيض الخرسانية وتحطم الحواجز الجانبية مما أدى إلى خروج المياه من قناة المفيض وجرفها للتلال الترابية المحيطة والتي تشكل خطرا في حال وصولها لجسم السد الرئيسي، مما حد بالسلطات إلى اجلاء أكثر من 180،000 شخص يعيشون في اتجاه مجرى النهر على طول . (ar)
- In February 2017, heavy rainfall damaged Oroville Dam's main and emergency spillways, prompting the evacuation of more than 180,000 people living downstream along the Feather River and the relocation of a fish hatchery. Heavy rainfall during the 2017 California floods damaged the main spillway on February 7, so the California Department of Water Resources stopped the spillway flow to assess the damage and contemplate its next steps. The rain eventually raised the lake level until it flowed over the emergency spillway, even after the damaged main spillway was reopened. As water flowed over the emergency spillway, headward erosion threatened to undermine and collapse the concrete weir, which could have sent a 30-foot (10 m) wall of water into the Feather River below and flooded communities downstream. No collapse occurred, but the water further damaged the main spillway and eroded the bare slope of the emergency spillway. (en)
- La crise du barrage d'Oroville de 2017, en Californie du nord est une crise associant le risque d’effondrement de tout ou partie du déversoir principal (voire de la digue) du plus haut barrage des États-Unis, le barrage d'Oroville, avec mise en péril des vies et les biens situés dans la zone aval du barrage dans le nord de la Californie. Ce barrage est situé dans le comté de Butte à environ 110 km (70 miles) au nord de Sacramento. Avec 235 m de hauteur, il est le plus haut des États-Unis et était le barrage le plus grand au monde au moment de sa construction qui a coûté un demi milliard de dollars de l’époque. Il a été prévu selon ses concepteurs pour affronter les tremblements de terreainsi qu’une crue cincentennale et a fait l’objet d’études de stress géomécanique. Il est alimenté par la rivière Feather dont il doit contrôler et réguler le débit. Début février 2017 des pluies de tempêtes ont causé des dégâts importants au déversoir du barrage, ce qui empêche le gestionnaire de faire fonctionner le déversoir à plein régime pour évacuer les eaux de crue, ce qui menacerait l'intégrité structurelle du déversoir. En raison de la menace d'inondation catastrophique (une vague de 9 à 10 mètres de haut pourrait déferler en cas de rupture brutale), plus de 180 000 personnes vivant le long de la rivière Feather ont été évacuées. (fr)
- https://damsafety.org/sites/default/files/files/Independent%20Forensic%20Team%20Report%20Final%2001-05-18.pdf
- https://pixel-ca-dwr.photoshelter.com/galleries/C0000OxvlgXg3yfg/G00003YCcmDTx48Y/Oroville-Spillway-Incident
- https://gizmodo.com/dramatic-satellite-images-show-the-oroville-dam-from-dr-1792474219
- http://www.water.ca.gov/oroville-spillway/
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- Baby salmon being rounded up from the murky waters at the Feather River Fish Hatchery, due to soil eroded at the spillway, and unloaded at the Thermalito Afterbay Complex (en)
- Damage to the main spillway began as a crater in the middle and eventually resulted in a separate channel eroded to the side . At left, the main spillway is shown in March 2011 while at its maximum discharge rate. (en)
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- أزمة سد أوروفيل 2017 (بالإنجليزية: 2017 Oroville Dam crisis) شكلت تهديدا كبيرا ومستمرا على الأرواح والممتلكات في شمال كاليفورنيا. يبلغ ارتفاع سد أوروفيل 770 قدم (235 م)، يُعد أطول سد في الولايات المتحدة. ويقع في مقاطعة بوت حوالي 70 ميل (110 كـم) شمال سكرامنتو، السد كّون ، ويتحكم في تدفق . (ar)
- In February 2017, heavy rainfall damaged Oroville Dam's main and emergency spillways, prompting the evacuation of more than 180,000 people living downstream along the Feather River and the relocation of a fish hatchery. (en)
- La crise du barrage d'Oroville de 2017, en Californie du nord est une crise associant le risque d’effondrement de tout ou partie du déversoir principal (voire de la digue) du plus haut barrage des États-Unis, le barrage d'Oroville, avec mise en péril des vies et les biens situés dans la zone aval du barrage dans le nord de la Californie. Ce barrage est situé dans le comté de Butte à environ 110 km (70 miles) au nord de Sacramento. (fr)
- أزمة سد أوروفيل 2017 (ar)
- Crise du barrage d'Oroville de 2017 (fr)
- Oroville Dam crisis (en)
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