查询词典 alluvial

Also using the exterior expression for the Graf′s addition theorem, the exact solution for scattering of plane SH waves by circular arc alluvial valley is presented in the paper. From the numerical results the complex effect of the depth-to-width ratio of the alluvial valley on the surface ground motion is found.

利用Graf加法公式的外域型表达，本文还给出了任意圆弧型沉积盆地出平面散射的精确级数解答，提供了大量数值结果并指出了盆地深宽比对地面运动的复杂影响作用。

Jiuquan city in the alluvial plain of alluvial fans and between about 1449 meters above sea level.

酒泉市城区处于洪积扇和冲积平原之间，海拔1449米左右。

The eastern Laizhou Bay is an important potential area of littoral placer gold deposits of China, in Which both eluvial-deluvial and alluvial placer gold deposits are found. And placer gold anomaly is discovered in the littoral sand barrier, beach, subaqueous bar, subaqueous estuarine delta, seawater shallower than 14m, ancient lagoon, ancient alluvial layers and ancient coastline.

莱州湾东部是我国滨海砂金矿重要的成矿远景区，区内已探明有残坡积型和冲积型砂金矿床，并在滨海沙堤、沙滩、水下沙坝、水下三角洲、水深小于14m的浅海海域及古岸线、古泻湖、古冲积层中发现砂金异常，特别是海区的发现，为我国浅海砂金的调查开阔了新的前景。

The indices comprise the greatest rock's volume in alluvial cone, the greatest cognizable single alluvium's thickness, the surface slope in alluvial cone, the vegetation and land use, the soil erosion, and the runoff.

在荒溪分类的基础上，提出了荒溪内危险区划分技术，给出了不同荒溪类型沟道危险区划分方法和冲积圆锥危险区划分的指标体系（冲出石块的最大体积、可辨认的单次淤积的最大厚度、冲积圆锥表面坡度、植被状况和土地利用情况、侵蚀状况、径流状况等）及数量化评分方法。

According to a couple of international seminars attended by the author of this paper and his on-the-spot investigation of alluvial gold fields at Yukon District of Canada in the year of 1989, an analysis and summary of the mining art and ore dressing of alluvial gold in Canada were made by the author himself.

根据1989年在国外期间参加的两次研讨会，以及对育空地区砂金产地的现场考察，归纳分析了加拿大砂金采选技术。200多座家庭式生产经营的中、小矿山，构成育空地区和全加拿大砂金产量的大部分。

As aresult of fluvial scouring and aggrading the riverbed, the alluvial layer of circular-arclayered alluvial valleys is fluid-saturated porous medium.

由于河流的淤积和冲刷，沉积河谷场地的沉积层多为饱和土。

More and more research proves that alluvial fan is affected by many environmental factors such as tectonic activity, climatic conditions, base level change, drainage basin geology, geomorphology and plant covering of drainage basin, human activities; therefore, alluvial fan research bears great significance to theory of geomorphology and practicalities.

越来越多的研究表明，冲积扇的演化受构造、气候、基准面、流域地质地貌条件、植被覆盖程度以及人类活动等诸多环境因素的影响，因此，冲积扇研究具有十分重要的理论意义和现实意义。

The fault terrace zone controlled the occurrence and distribution of sand deposits, developing alluvial fan-fan delta system on the steep slope fault terrace and alluvial fan-fluvial-delta on the gentle slope fault terrace.

断阶带控制砂体的发育与展布，陡坡断阶带发育冲积扇-扇三角洲沉积体系，而缓坡断阶发育冲积扇-河流-三角洲沉积体系。

Lithological characterized by pyroclastic rocks interbedded with sedimentary rocks, with a few volcanic rocks.(2) The sedimentary facies: include normal fluvial, swamp, littoral and shallow lakes, as well as fallout facies of pyroclastic sediments, volcanic lahar facies, pyroclastic alluvial facies and pyroclastic fluvial facies (different from normal alluvial and fluvial facies).

1岩性——以火山碎屑岩、火山碎屑沉积岩和陆源碎屑沉积岩互层为特征，亦夹有少量火山岩；(2)沉积相类型——包括陆源碎屑沉积的河流相、沼泽相、滨浅湖相和火山碎屑沉积的空落相、火山泥石流相、火山碎屑冲积扇相和火山碎屑河流相(与陆源碎屑的冲积扇相和河流相不同)。

The study results show that:①The distribution of Cd in shallow surface soils is characterized as: The content of Cd in lacustrine deposit, alluvial lacustrine and alluvial-diluvial low-lying plain is 1.4 to 1.8 times as high as in alluvial-diluvial high valley flat and alluvial-diluvial high bank physiognomy areas.②The content variation of Cd in horizontal distribution was controlled by clay primarily and OrgC secondly. The variation of OrgC was major factor that affected the content variation of Cd in vertical distribution.

结果表明：①研究区浅层土壤中w的分布特征为，湖积低平原区、冲－湖积低平原区及冲洪积低洼平原区地貌成因类型土壤中的含量明显高于冲洪积高漫滩平原区、冲洪积高亢平原区地貌成因类型土壤，其质量分数差异达1.4~1.8倍；②研究区不同地貌成因类型土壤中，w的横向分布特征主要受黏粒含量分布的控制，其次是wC(下标 org；垂向分布特征的主要控制因素是wC

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。