河床

Since the middle of the 1980s, large scale of sand excavation has resulted in the great changes of the fluvial process and the hydrological conditions.

自20世纪80年代以来，该水系大规模的人工挖沙导致了水文条件、河床演变自然进程的较大变化。

Therefore study on riverbank erosion mechanisms and their application, can not only enrich and develop the basic theory of fluvial process, but also perfect and advance the current sediment mathematical models.

因此河岸冲刷机理及其应用研究，不仅能丰富和发展河床演变学的基本理论，而且能进一步完善和提高现有的泥沙数学模型。本文的主要研究内容如下

We can go through Mr. O'Hara's river bottom and the Fontaine's pasture and get there in no time .

咱们可以穿过奥哈拉先生家的河床和方丹家的草地，很快就能赶到那里。

Lake Okeechobee, the second-largest fresh-water lake in the country, is showing dry patches from lack of rain.

由于降雨稀少，美国第二大淡水湖欧基求碧湖也已露出干旱的河床。

Upset that Taft's body had been left on the battlefield amidst the chaos, Nadal and his radio officer, Sergeant Jack Gell, brought Taft and the bodies of other Americans back to the creek bed under heavy fire.

由于Taft中尉的尸体被遗留在混乱不堪的战场上，Nadal和他的无线员Jack Gell军士，在美国猛烈的炮火掩护下找Taft中尉的尸体并被带回到小湾河床美方一侧。

They were packed with images of wide farms, dry riverbeds, windswept veld, frolicking gemsbok and scratching guinea fowl.

这些诗篇的意象里是宽阔的农场，干涸的河床，刮风的草场，嬉戏的大羚羊还有觅食的珍珠鸡。

As a generalisation grades tend to go higher as water levels increases because of the steep nature of river gradients in this country.

一般来说，在这个国家当水位升高时，水速增快，这是由于河床坡度增高而引起的。

Based on analysis of the factors affecting subgrade local scour along the river such as condition of stream,condition of bed form,geometric boundary condition of river,water depth and speed of every section,scour depth of parapet,the progress of scour and the form of stream near parapet were observed through the way of field model experiment.

在对沿河路基局部冲刷影响因素如水流条件、河床沙条件和河流几何边界条件等进行分析的基础上，通过野外模型试验，观测了河流各断面的水深、流速、护墙的冲刷深度和冲刷的发展过程及护墙附近的水流形态。

The dry river beds are full of living things: gorse, poppies, tall yellow sunflowers.

干枯的河床上充满了活跃的生物：金雀花，罂粟，高高的桔黄色向日葵。

The bay's tidal channels, mudflats, and sandbanks support roughly 150,000 birds, including the African black oystercatcher, lesser and greater flamingo, chestnut-banded plover, and blacknecked grebe, according to the atlas.

海湾的潮汐河床、泥滩和沙洲养育了15万只鸟类，包括非洲黑蛎鹬，小火烈鸟，大火烈鸟，金斑鸻，黑颈鸊鷉。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。