简介:Thepaperdescribesapermeametertestmethodfordeterminationofthehydraulicconductivity(AT)alongmulti-directionsinfluvialsedimentswithcrossbeddings.Unlikeexistingin-situpermeametermethodsthatdeterminehydraulicconductivityforsubmergedstreambeds,ourmethodwasintendedtomeasurehydraulicconductivityofexposedstreambedsorfluvialsediments.ThemethodwasappliedtotheWeiRiver,ShaanxiProvince,CentralChinaforcharacterizationoftheanisotropyofKinawell-sortedfluvialsediment.Theresultsillustratedthateveninwell-sortedsediments,cross-beddingandsedimentfabrication(ortexture)canleadtovariedKvaluesalongdifferentmeasurementdirections.TheKvaluewasthelargestalongthedipdirection(orthemajordirection)thatisparalleltotheorientationofcrossbeddingandthesmallestinthedirectionperpendiculartothebedding(ortheminordirection).TheKvalueinagivendirectionbetweenthemajorandminordirectionoftenfellintherangeboundedbytheKvaluesinthemajorandminordirections.TheanisotropyratioofK(theratioofKvaluebetweenthemajorandminordirections)intwotrenchesforthiswell-sortedfluvialsedimentwasupto1.14to1.23,respectively.Ourresultsalsodemonstratedthatevenforwell-sortedsediments,theKvaluesbetweentwosamplingpointsonlyabout10cmapartcandiffer.ItisclearthattheKdistributionstronglycorrelatestothebeddingorientation.
简介:最后二十年在自然的河里为浅流动见证正常数字模型的开发和应用程序。然而,直到现在,为有不一致的沉积运输的流动没有如此的模型。这篇论文论述1D在冲积的河里模仿流动和不一致的沉积的非能力运输的正常模型。活跃的层明确的表达被采用解决床沉积作文的变化。在集中的有限体积斜坡LImiter(SLIC)的框架策划,一个表面坡度方法被合并达到正常答案到管理方程。建议模型与不规则的地形学靠着典型盒子被测试,包括挖出的沟再装满,沉积由于沉积由于山崩水坝失败过载和洪水流动。在计算结果和测量数据之间的协议是令人鼓舞的。比作一个非正常的模型,正常模型特征在复制舞台,速度和床变丑改进了性能。它应该在冲积的河里为不一致的沉积运输建模发现一般应用,特别在床地形学主要是不规则的山区。