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(剑5Test3ReadingPassage2)DisappearingDelta翻译谁有啊AThefertilelandoftheNiledeltaisbeingerodedalongEgypt'sMediterraneancoastatanastoundingrate,insomepartsestimatedat100metresperyear.Inthepast,landscoured
 更新时间:2024-04-26 12:50:29
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(剑5Test3ReadingPassage2)DisappearingDelta翻译谁有啊

AThefertilelandoftheNiledeltaisbeingerodedalongEgypt'sMediterraneancoastatanastoundingrate,insomepartsestimatedat100metresperyear.Inthepast,landscouredawayfromthecoastlinebythecurrentsoftheMediterraneanSeausedtobereplacedbysedimentbroughtdawntothedeltabytheRiverNile,butthisisnolongerhappening.

BUptonow,peoplehaveblamedthislossofdeltalandonthetwolargedamsatAswaninthesouthofEgypt,whichholdbackvirtuallyallofthesedimentthatusedtoflowdowntheriver.Beforethedamswerebuilt,theNileflowedfreely;carryinghugequantitiesofsedimentnorthfromAfrica'sinteriortobedepositedontheNiledelta.Thiscontinuedfor7,000years,eventuallycoveringaregionofover22,000squarekilometreswithlayersoffertilesilt.Annualfloodingbroughtinnew,nutrient-richsoiltothedeltaregion,replacingwhathadbeenwashedawaybythesea,anddispensingwiththeneedforfertilizersinEgypt'srichestfood-growingarea.ButwhentheAswandamswereconstructedinthe20thcenturytoprovideelectricityandirrigation,andtoprotectthehugepopulationcentreofCairoanditssurroundingareasfromannualfloodinganddrought,mostofthesedimentwithitsnaturalfertilizeraccumulatedupabovethedaminthesouthern,upstreamhalfofLakeNasser,insteadofpassingdowntothedelta.

CNow,however,thereturnsouttobemoretothestory.Itappearsthatthesediment-freewateremergingfromtheAswandamspicksupsiltandsandasiterodestheriverbedandbanksonthe800-kilometretriptoCairo.DanielJeanStanleyoftheSmithsonianInstitutenoticedthatwatersamplestakeninCairo,justbeforetheriverentersthedelta,indicatedthattheriversometimescarriesmarethan850gramsofsedimentpercubicmetreofwater—almosthalfofwhatitcarriedbeforethedamswerebuilt.I'mashamedtosaythatthesignificanceofthisdidn'tstrikemeuntilafterIhadread50or60studies,'saysStanleyinMarineGeology.Thereisstillalotofsedimentcomingintothedelta,butvirtuallynosedimentcomesoutintotheMediterraneantoreplenishtheCoastline.Sothissedimentmustbetrappedonthedeltaitself.'

DOncenorthofCairo,mostoftheNilewaterisdivertedin

马云斌回答:
  尼罗三角洲的肥沃土地沿埃及的地中海海岸被腐蚀以令人惊奇率,在有些零件估计在每年100米.以前,土地走遍远离海岸线由地中海的潮流曾经被沉积被带来的黎明替换到由河尼罗的三角洲,但是这不再发生.   B到现在,人们在二个大水坝责备了三角洲土地这损失在埃及的南部的阿斯旺,SED的阻止实际上全部
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