简介：小规模的bedforms的词法特征在Dafeng潮汐的公寓上借助于声学的介绍声纳被测量，江苏在2009，并且在Jiulong河口，厦门在2010，分别地。多阀值价值方法被利用揭示bedforms是在场的词法沿着波动。获得的数据集的分析显示出那：(1)沙涟漪能有不规则的形状，并且(2)在bedform形态学的变化在一个单个潮汐的周期以内是小的，但是可能在几个潮汐的周期上重要。分数维图形和海床粗糙的variogram分析揭示了在当前的速度和海床粗糙的分数维的尺寸之间的一种重要关系的存在。作为当前的速度增加，有小规模的底部结构的一个趋势的海床粗糙增加被大规模结构正在代替。而且，大规模底部结构的表面也能由于小规模的特征的缺席变得光滑或由于附加小规模的结构的存在变得更不平。

简介：Non-uniformsedimentdepositedinaconfined,steepmountainchannelcanalterthebedsurfacecomposition.Thisstudyevaluatesthecontributionofgeometricandresistanceparameterstobedstabilizationandthereductioninsedimenttransport.Flumeexperimentsweredoneundervarioushydraulicconditionswithnon-uniformbedmaterialandnosedimentsupplyfromupstream.Resultsindicatethatflumechannelsrespondinasequenceofcoarseningandwiththeformationofbedformroughnessfeaturessuchasrapids,cascades,andsteps.Abedformdevelopmentcoefficientisintroducedandisshowntoincrease(i.e.verticalsinuositydevelops)inresponsetoincreasingshearstressduringtheorganizationprocess.ThebedformdevelopmentcoefficientalsoispositivelycorrelatedwiththecriticalShieldsnumberandManning'sroughnesscoefficient,suggestingtheevolutionofflowresistancewithincreasingbedformdevelopment.Thesedimenttransportratedecreaseswithincreasingbedshearstressandbedformdevelopment,furtherillustratingtheeffectofbedstabilization.Anempiricalsedimenttransportmodelforanequilibriumconditionisproposedthatusesthebedformdevelopmentcoefficient,relativeparticlesubmergence(i.e.theratioofmeanwaterdepthandmaximumsedimentdiameter),modifiedbedslope,anddischarge.Themodelsuggestsbedformdevelopmentcanplayaprimaryroleinreducingsedimenttransport(increasingbedstabilization).ThemodelisanextensionofLane's(1955)relationspecificallyadaptedformountainstreams.Theseresultsexplainthesignificanceofbedformdevelopmentinheighteningflowresistance,stabilizingthebed,andreducingsedimenttransportincoarse,steepchannels.