首页
登录
职称英语
[originaltext] Your professor has asked me to talk to you today about the to
[originaltext] Your professor has asked me to talk to you today about the to
游客
2023-09-17
16
管理
问题
Your professor has asked me to talk to you today about the topic that should be of real concern to civil engineers: the erosion of the US beaches. Let me start with some statistics, Did you know that 90% of the coast in this country is eroding, on the gulf of Mexico for instance, erosion averages 4 to 5 feet per year? Over the past 20 years, there has been an increase in building along the coast, even though geologists and environmentalists have been warning communities about problems like erosion. Someway, communities have tried to protect their buildings and roads and to build seawalls. However, geologists have found that such stabilizing structures actually speed up the destruction of the beaches. These beaches with seawalls, called stabilized beaches, are much narrower than beaches without them. You may wonder how seawalls speed up beach loss. The explanation is simple. If the flow of the beaches is gentle, the water energy is lessened as it washes up along the shore. It is reduced even more that returns to the sea so it doesn’t carry back much sand. On the other hand, when the water hits the nearly vertical face of the seawall, it goes straight back to the sea with the full force of its energy and it carries back a great deal of sand. Because of the real risk of losing beaches, many geologists support a ban on all types of stabilizing construction on shorelines.
选项
A、By sending water directly back to the sea with great force.
B、By reducing wave energy.
C、By reducing beach width.
D、By stabilizing beachfront construction.
答案
B
解析
How does a gently sloping beach help prevent erosion?
转载请注明原文地址:https://www.tihaiku.com/zcyy/3020730.html
相关试题推荐
[originaltext]M:WhatareyougoingtodoafteryourreturnfromNewYork?W:I
[originaltext]M:WhatareyougoingtodoafteryourreturnfromNewYork?W:I
[originaltext]W:IthinkI’lltakethewholedaytourofthevillage.M:Whyn
[originaltext]W:IthinkI’lltakethewholedaytourofthevillage.M:Whyn
[originaltext]M:Doyoufeellikegoingtothecinema?W:Oh,yes.Whatkindof
[originaltext]M:Doyoufeellikegoingtothecinema?W:Oh,yes.Whatkindof
[originaltext]M:MayIspeaktoPetty?W:Speaking.M:Goodmorning,Petty.W:
[originaltext]M:MayIspeaktoPetty?W:Speaking.M:Goodmorning,Petty.W:
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefo
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefo
随机试题
Anumberofscientificstudieshavefoundthattheamountofsugarweconsum
[originaltext]W:Sir,you’vebeenusingtheonlinecatalogueforquiteawhile,
某银行信息支撑系统采取()的数据备份策略,每天定时备份上次备份后变化过的数据信
6个月婴儿,双胎之小,面色苍白2个月,呈加重趋势,食欲减退。平时易感冒,未加辅食
A.β-氨基异丁酸B.β-丙氨酸C.别嘌呤醇D.5-氟尿嘧啶E.氮杂丝氨酸能治疗
青霉素最常见和应警惕的不良反应是A.过敏反应B.腹泻、恶心、呕吐C.听力减退D.
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
经济增长方式是指( )。A.经济发展的目标形式 B.经济发展的决策模式 C
下列行为中,不征收土地增值税的有()。A.国有土地使用权出让 B.房地产
下列设备中,属于消火栓灭火系统的有( )。A.给水设备 B.报警阀组 C.
最新回复
(
0
)