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
54
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、To protect beachfront property.
B、To reduce the traffic on beach roads.
C、To provide privacy for homeowners.
D、To define property limits.
答案
A
解析
Why do communities build seawalls?
转载请注明原文地址:https://tihaiku.com/zcyy/3020729.html
相关试题推荐
[originaltext]M:WhatareyougoingtodoafteryourreturnfromNewYork?W:I
[originaltext]W:Itwasaheavystormlastnight,wasn’tit?M:Itcertainlywa
[originaltext]W:Itwasaheavystormlastnight,wasn’tit?M:Itcertainlywa
[originaltext]W:IthinkI’lltakethewholedaytourofthevillage.M:Whyn
[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:Thetrainleavesevery30minutes.You’refiveminuteslatefo
随机试题
Theindirectpolicyinstrumentsincluderequiredreserveratio,interestratead
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonc
ClocksthroughTimeIttookhumanbeingalongtimetoinven
Thesegoodsaresoldatreducedprices,______.A、thedefectsarepointedoutto
A、Arrivingontime.B、Dressingproperly.C、Beingpolite.D、Talkingslowly.A由句(5
某公司计划期初有某型飞机18架,计划3月份增加3架,7月份报废2架,9月份再增加
某县一中学初一学生张某不住校,有次上午9点多才赶到学校,而此时已上第二节课了。他
公司调研的主要内容包括()。A:公司财务与会计信息B:公司发展战略C:公司募
资产组合理论的提出者()。 A.哈里?马科维兹B.威廉?夏普C.斯蒂芬?
正常人时间肺活量第1秒末呼出气量占肺活量的百分比是( )。A.60% B.6
最新回复
(
0
)