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gradient break
相关语句
  坡折
     Structural, lithological, stratigraphic, buried-hill and combined reservoirs exist on gentle slopes of the Jiyang depression. Nose belt, stratigraphic onlap-denudation belt, gradient break belt and buried-hill belt are important reservoirs assemble belts.
     济阳坳陷缓坡带发育构造、岩性、地层、潜山和复合油气藏,鼻状构造带、地层超剥带、断裂坡折带、潜山带是重要的油气藏聚集带。
短句来源
  相似匹配句对
     Break the Ice
     打破坚冰
短句来源
     gradient elution;
     梯度洗脱;
短句来源
     On Break of Singing
     论歌唱的破音现象
短句来源
     Gradient of the Text
     文本的梯度
短句来源
     Leak pressure and break down pressure gradient were increased, and safe density window was enlarged.
     超低渗透钻井液封堵隔层承压能力强,能提高漏失压力和破裂压力梯度,相当于扩大了安全密度窗口。
短句来源
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In the lower reaches of the yarlungzangbo river there exhibits a marvellous Hairpin-like Great Bend Gorge with valley in valley. The channel of the Great-Bend valley cut down into the rock flows through many interlocksed epurs. It is obvious that the Bend is a beautiful incised meander. The width of the channel is only about 70-80 meters.The diagram of the longitudinal profile of the river bed is convex upward with the gradient break like a flight of stairs. The slope of the channel and the velocity of...

In the lower reaches of the yarlungzangbo river there exhibits a marvellous Hairpin-like Great Bend Gorge with valley in valley. The channel of the Great-Bend valley cut down into the rock flows through many interlocksed epurs. It is obvious that the Bend is a beautiful incised meander. The width of the channel is only about 70-80 meters.The diagram of the longitudinal profile of the river bed is convex upward with the gradient break like a flight of stairs. The slope of the channel and the velocity of flow can reach locally 44.9‰ and 16 meters per second. The canyon terraces along the valley are distributed in odd pieces. Owing to the high altitude and precipitous valley slopes and strong physical weathering, the rock debris on the slopes moved down quikly.These topographic features of the Great Bend valley above-mentioned reflect controls exerted by geological structure system, which shows the great intensity of the new tectonic movement. A violent earthquake (8.5 grade) , occurring in Cayu on August 15th, 1950, had a great influence on the geomorphology of Great Bend valley.As regards the origin of the Great bend valley, we can classify the lower reaches of the Yarlungzangbo river into two parts. One is above the Parlungzango river. The valley is developed in a huge arcuate flalt zone with a big angle, where the northward drifting of the Indian Plate was thrusted under the Euasian Plote. And below it, the valley adapts itself to a group of north-south to east-north trending fault zone. The Great Bend valley is an antecedent gorge developed along the tectonic fractional zone of different directions. It is erroneous to consider that the Yarlungzangbo river flowed westwards in the geologicol times and the Great Bend was an elbow of capture, as postulated by some authors.

雅鲁藏布江下游作发夹形的奇特大拐弯,并构成深峻的峡谷。本文根据实地考察的资料,阐明大峡弯的地貌特征,并结合地质构造的分析,认为包括大峡弯在内的雅鲁藏布江是适应不同方向断裂构造发育的先成河。大峡弯不是河流的袭夺弯,雅鲁藏布江曾经由东向西流的看法是没有根据的。

Based on granulometric analysis on the present deposits of the typical wetland in Poyang Lake, the components of these present deposits are exposed to range mainly from fine silt with mud to very fine muddy silt, showing low-energy depositional environment of the delta front. The grain-size distributions are mainly controlled by the gravitative lake current and partly reworked by wind wave actions. During flood periods, the lake gravitative current is dominative since it controls not only grain-size regional...

Based on granulometric analysis on the present deposits of the typical wetland in Poyang Lake, the components of these present deposits are exposed to range mainly from fine silt with mud to very fine muddy silt, showing low-energy depositional environment of the delta front. The grain-size distributions are mainly controlled by the gravitative lake current and partly reworked by wind wave actions. During flood periods, the lake gravitative current is dominative since it controls not only grain-size regional distributions, but also the rule which granulometric characteristics gradually change from the top of meadow bottomlands to muddy bottomlands. During low water periods, the wave and wind actions are active. In transitional bottomland at the wind-faced bank at the sedimentary section profile, the wave action reworks sediments much coarser, and results in granulometric features accordant change and, especially, abrupt change at the topographic gradient break of larger depression. The wind erodes "Sand Hill" and moves eroded materials to the wetland nearby, which makes sediment coarser and richer in sand in part of the wetland. These dynamic actions also control the wetland evolution and result in the following eco-environment aggravation, i.e. , the wetland, the meadow bottomland, the transitional bottomland and the muddy bottomland expansed, and water area gradually replaced by the meadow bottomland during low water periods. However, the above-mentioned problem can be solved by building sluice-dams.

通过对沉积物粒度分析,揭示出鄱阳湖典型湿地现代沉积物主要由含泥细粉砂至泥质极细粉砂组成,反映出三角洲前缘低能沉积环境。控制湿地粒度分布的动力,主要为重力型湖流,但波浪和风的作用也参与了沉积物的搬运与沉积。汛期,重力型湖流不仅控制了粒度分布的区域特征,而且决定了由草滩顶部-草滩下部-过渡带-泥滩沉积断面上粒度特征递变规律;枯水期,波浪作用的改造,使得沉积断面上的过渡带沉积物粗化,并使各粒度参数相应变化,特别是面积较大洼地的迎风岸,在过渡带地面坡度转折处,出现了粒度突变或跃变;风蚀“沙山”物质的搬运,使得“沙山”附近的湿地含砂量猛增,粒径变粗。这些动力作用,还控制着湿地的演化,即湿地范围增大,草滩扩张,过渡带以及泥滩下移,枯水期洼地水面缩小且趋于消亡,严重影响湿地的生态环境,但可通过建造人工闸坝加以控制。

 
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