{"product_id":"2940149096138","title":"Quantitative rock-fall hazard and risk assessment for Yosemite Valley, Yosemite National Park, California","description":"Rock falls are common in Yosemite Valley, California, posing substantial hazard \u003cbr\u003eand risk to the approximately four million annual visitors to Yosemite National Park. \u003cbr\u003eRock falls in Yosemite Valley over the pastfew decades have damaged structures and \u003cbr\u003ecaused injuries within developed regions located on or adjacent to talus slopes, \u003cbr\u003ehighlighting the need for additional investigations into rock-fall hazard and risk. This \u003cbr\u003eassessment builds upon previous investigations of rock fall hazard and risk in Yosemite \u003cbr\u003eValley (Wieczorek et al., 1998, 1999; Guzzetti et al., 2003; Wieczorek et al., 2008), and \u003cbr\u003efocuses on hazard and risk to structures posedby relatively frequent fragmental-type rock \u003cbr\u003efalls (Evans and Hungr, 1999), up to approximately 100,000 m\u003cbr\u003e3\u003cbr\u003ein volume. \u003cbr\u003ePrevious rock-fall hazard assessments delineated two primary hazard zones in \u003cbr\u003eYosemite Valley defined by: (1) a line delineating the base of rock-fall talus and other \u003cbr\u003eslope movement debris, and (2) a line delineating the shadow angle limit (Wieczorek et \u003cbr\u003eal., 1998, 1999). The base of talus line encapsulates all rock debris on the valley floor \u003cbr\u003eand provides an important first approximation of the hazard, as evidence of past rockfalls \u003cbr\u003e(such as talus) is a generally a positive predictor of future rock fall deposition areas. \u003cbr\u003eHowever, by encapsulating all rock debris on the valley floor, the base of talus line \u003cbr\u003emapped by Wieczorek et al. (1998, 1999) does not discriminate between active rock fall \u003cbr\u003eand debris flow deposits and inactive rockavalanche and debris flow deposits. \u003cbr\u003eFurthermore, as a hazard approximation, the base of talus line does not address the \u003cbr\u003eexpected progradation of the talus edge as future rock falls accumulate on the talus slope.","brand":"ReadCycle","offers":[{"title":"Default Title","offer_id":47111764607216,"sku":"2940149096138","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/2940149096138_p0.jpg?v=1763711881","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/2940149096138","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}