What Is Hurricane Storm Surge, and Why Can It Be So Catastrophic?_我的网站
一 |
休赛期掘金选择匹配雷霆为斯潘塞-琼斯开出的 2 年 1200 万美元报价，将这名锋线球员留在丹佛。
By Anthony C. Didlake Jr.
Of all the hazards that hurricanes bring, storm surge is the greatest threat to life and property along the coast. It can sweep homes off their foundations, flood riverside communities miles inland, and break up dunes and levees that normally protect coastal areas against storms.
As a hurricane reaches the coast, it pushes a huge volume of ocean water ashore. This is what we call storm surge.
This surge appears as a gradual rise in the water level as the storm approaches. Depending on the size and track of the hurricane, storm surge flooding can last for several hours. It then recedes after the storm passes.
Water level heights during a hurricane can reach 20 feet or more above normal sea level. With powerful waves on top of it, a hurricane’s storm surge can cause catastrophic damage.
What determines how high storm surge gets?
Storm surge begins over the open ocean. The strong winds of a hurricane push the ocean waters around and cause water to pile up under the storm. The low air pressure of the storm also plays a small role in lifting the water level. The height and extent of this pile of water depend on the strength and size of the hurricane.
As this pile of water moves toward the coast, other factors can change its height and extent.
If a coastal area has a sea floor that gently slopes away from the coastline, it’s more likely to see a higher storm surge than an area with a steeper drop-off. Gentle slopes along the Louisiana and Texas coasts have contributed to some devastating storm surges. Hurricane Katrina’s surge in 2005 broke levees and flooded New Orleans. Hurricane Ike’s 15- to 17-foot storm surge and waves swept hundreds of homes off Texas’ Bolivar Peninsula in 2008. Both were large, powerful storms that hit in vulnerable locations.
The shape of the coastline can also shape the surge. When storm surge enters a bay or river, the geography of the land can act as a funnel, sending the water even higher.
Other factors that shape storm surge
Ocean tides – caused by the gravity of the moon and sun – can also strengthen or weaken the impact of storm surge. So, it’s important to know the timing of the local tides compared to the hurricane landfall.
At high tide, the water is already at an elevated height. If landfall happens at high tide, the storm surge will cause even higher water levels and bring more water further inland. The Carolinas saw those effects when Hurricane Isaias hit at close to high tide on Aug. 3, 2020. Isaias brought a storm surge of about 4 feet at Myrtle Beach, South Carolina, but the water level was more than 10 feet above normal.
How storm surge and high tide add up to coastal flooding.(The COMET Program/UCAR and National Weather Service)
Sea level rise is another growing concern that influences storm surge.
As water warms, it expands, and that has slowly raised sea level over the past century as global temperatures have risen. Freshwater from melting of ice sheets and glaciers also adds to sea level rise. Together, they elevate the background ocean height. When a hurricane arrives, the higher ocean means storm surge can bring water further inland, to a more dangerous and widespread effect.
。
二 |
琼斯近日更新个人社交媒体，回顾自己一路走来三次拒绝短期安稳机会，最终拿下这份千万合同的经历。
琼斯表示，自己如今顺利签下这份两年 1200 万美元的 NBA 合约，背后是三次关键抉择。第一，他放弃约 25 万美元的额外收益，选择留在斯坦福打完大学第五年，没有转学离开；第二，主动选择成为落选秀，以此获得自主挑选球队的权利，也正是这个选择，让他得以加盟掘金；第三，他回绝一份价值约 200 万美元的保障性续约合同，决定投身自由市场放手一搏，同时也要承担受伤、状态下滑，甚至得不到新合同的风险。
