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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
canadansis) and 22-year-old black locust on sandy sites along the Chaobai River in Beijing.
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Regularities of wind-erosion of different land-use types in Yongding River sandy land, Beijing
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The threshold wind velocity of a number of variables was studied in four different land-use types: farm land, forestland, wild grassland and a flood plain in the Yongding River sandy land in Beijing.
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Carbon storage of artificial forests in rehabilitated lands in the upper reaches of the Yellow River
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We studied 10-to 27-year-old artificial forests on rehabilitated lands in the upper reaches of the Yellow River with the objective of comparing the carbon densities of various artificial and natural forests.
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Method of determining grid sizes of finite element method of water quality models for geometrically complex river course
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Consequently division of grids and numerical calculation of water quality with finite clement method can be carried out on the basis of available method and topographic map of the river course.
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The minimal values in active channel and maximal in the near-bank zone are typical for those channel sections where heavy metals, present in a solid state, are transported as a suspended load (normally the largest part of a polluted river course).
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Palar River Basin, a crystalline rock region in North Arcot District (Tamil Nadu), India, possesses vast groundwater potential along and near the river course and its lands are fertile.
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In nine lakes and an old river course, the Tian'ezhou oxbow, investigated in the flood plain of the Yangtze River, A.
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Ecological Conservation Through Aesthetic Landscape Planning: A Case Study of the Lower Wisconsin State Riverway
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We found that overall species diversity increased in the Riverway, but remained constant in reference areas, although the relative increase in housing density in the two areas did not differ.
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We also found that omnivore populations decreased in the Riverway and increased in reference sites.
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On the whole, our study provides preliminary evidence that aesthetic landscape planning, such as employed in the Lower Wisconsin State Riverway, might constitute a politically viable approach to conserve ecological resources.
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A conceptual water balance methodology was used for evaluating groundwater movement among riverway, irrigation ditches, irrigation area and non-irrigation area, based on the recorded water diversion.
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| | ~~ | | 本文着重分析了荆江河曲形成的边界条件,指出沙层之上复有厚层粘土的二元结构,或沙与土互层结构的土质条件,对荆江河曲的形成与发展起了极其重要的作用。同时,从对荆江在2500年内河床类型的演变过程的分析中,阐明了历史时期内分流穴口的淤塞,使荆江流量增大,洪水位增高,促进了河漫滩相粘土层的迅速增厚,造成了在水流作用下,河岸的相对可动性小於河底的边界条件,因而促使荆江的河型由三角洲分(氵义)河床转化为河曲。最后根据400多年来荆江各段河床平面变形形式的不同将荆江河曲划分出五种弯道演变的类型。自然界中蜿蜒曲折的河床称为河曲,它是普遍存在的一种河床类型。远在2000多年前,我国著名学者管子就提出“水性至曲”的现象。1870年英国著名地质学家C.莱伊尔(C.Lyells)开始从地质地貌观点研究河曲成因与演变。1908年法国河道工程师L.法格(L.Fargue)阐明弯道形态特性。随后学者们从地貌、地质、水文、泥沙与河流动力等方面对河曲进行了广泛的研究,提出了数十种假说,但河曲成因至今还被认为是理论上悬而未决的问题。而本文探讨的荆江河曲又有其复杂的形成条件,但我们认为只要遵循毛主席的教导:“马克思主义的最本质的东西,... | | 文摘来源 | | Based on histerical charts since 1842 and a sizable amount of data from hydrological survey an analytical study of the dynamic features and channel process of South Branch of Yangtze Estuary is made in this paper.The South Branch belongs to the mesotidal river region of the mesotidal estuary.It receives almost the entire discharge from Yangtze River,but tidal flow also plays an important part.Moreover,the flood and ebb currents take up different routes.The development of South Branch Ohannel is a complicate... | | 本文根据大量的水文测验资料和一百多年来的历史图件,分析了长江河口南支河段的动力特征和河槽演变的特性。南支河段属中潮河口中的中潮河段。它几乎承受全部的长江巨量径流下泄,潮汐作用也很重要,有涨落潮流路不一致的现象。南支河段河槽演变复杂。上承的徐六泾窄河段,是一个人工节点。南支上口因白茆沙分为南北水道,白茆沙区段属江心洲河型。下口进入南北港分流口摆荡范围,一百多年来经历了十分复杂的演变过程,是南支河段河槽演变中最为剧烈的地区。南支河道在横向上有巨大的扁担沙体把南支主槽和新桥水道分开,成为一个复式河槽。南支主槽目前是一个单一河槽,但它是一个复杂多变的区段,它既受白茆沙南北水道分流合流变化的影响,也受到南北港分流变化的影响,它北面的扁担沙是一个活动阴沙,只有它的南岸边滩一百多年来一直稳定,变化甚少。目前,南支主槽正处在演变剧烈的阶段。南北港分流口摆动于杨林口到吴淞口之间,摆动范围上下达26公里。分流口的演变是南支河段不能稳定的一个重要因素。经分析研究,我们认为分流口的位置以距离石头沙钢标10~12公里为宜,分流水道轴线与南支主泓之间的交角以50~60°较为有利。 | | 文摘来源 | | The Tuo River is a branch of the Yangtze River in Sichuan. It zigzags through the Fangshan Hiils in the Sichuan Basin and has cultivated typical deep-cut meanders of increasing amplitude embedded in red rock. Alog the two banks are multi-level river terraces where towns, factories, mines, stations, traffic ways and economic plants are scattered. The chief purpose of this paper is to provide an analysis of the present state, formation and tendency of development of the bends and terraces here and to provide ... | | 沱江是长江在四川的一条支流,在四川盆地内流经方山丘陵区,河道曲折弯转,发育了较典型的嵌入红岩的增幅深切曲流,沿江两侧有多级河流阶地,是城镇、厂矿、站驿、交通道路与经济作物分布区。本文的主要目的,是分折河曲与阶地的现状、形成和发展趋势,为有关部门更好地改造和利用河曲与阶地,提供地貌方面的科学依据。 | | 文摘来源 | |   | | << 更多相关文摘 |
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