河道支流

Based on the Saint-venant equations describing the channel flow movement, the nonlinear algebraic equations derived by the use of Preissmann weighted implicit four-point scheme are solved with the Netwon-Raphson method. A combined Gauss main-element elimination method with compress-storage technique is proposed. The relaxation iterative method for solving branch river networks is extended, which can turn the problem of any complex river networks into the problem of a series of single rivers. The coupling of hydraulic model with water quality model is built up. The combined model was applied to a large complicated river networks with numerical hydraulic structure which influenced by strong tide, storm and heave rain. Visualization of computational results is realized by means of MapInfo, which displays the computational results in fast, convenient and accurate way.

水力模型以描述河道洪水波运动的Saint-Venant方程组为基础，用Newton-Raphson方法直接求解按Preissmann加权四点格式进行离散所得的非线性代数方程组，提出了压缩存贮形式的Gauss列主元消去法并对数值解的收敛性进行了讨论；将支流流量的松弛迭代方法从树状河系推广到了环状河网，使任意复杂河网水力计算的问题都可化为一系列的单一河道的水力计算问题；建立了水力模型与水质模型的联接，初步应用于既有洪水、暴雨、强潮等综合影响，又存在多种水工建筑物及水力调度问题的大型复杂河网中的非恒定流水力、水质计算问题；利用MapInfo对计算结果的可视化进行了研究，有利于决策者快速、方便、准确地作出决策。

The object of your mission is to explore the Missouri River, and such principals stream of its, as, by its course and communication with the waters of the Pacific Ocean...may offer the most direct and practicable water communication across this continent for the purpose of commerce.

你的任务目标是探索密苏里河和极其主要支流，例如，其河道和通达太平洋的水道……可作为商业用途、横跨大陆的直接和实用的交通水路。

His objective was to display diatoms in a modern way using super contrast and careful application of color.

L Odam，于是开始在英国的各个河道支流收集、研究硅藻。

Due to the construction development and rebuilding of the old city in Linyi, though the city's flood-control and waterlog-drain system have been improved for several times, there are still many problems at present such as low standards, too many obstructive buildings in riverways and unmatched branch projects.

随着临沂城市建设的发展和旧城改造，城市防洪、排涝体系虽然经过几次治理，但临沂城现状防洪排涝体系仍普遍存在着标准低、河道阻水建筑物多、支流工程不配套等问题。

The reduction of sediment transported down the Mississippi River was the result of engineering modification of the Mississippi, Missouri, and Ohio rivers and their tributaries by dams, meander cutoffs, river-training structures, and bank revetments and soil erosion control programs in the areas drained by them.

夹带砂石量的减少是由于沿河地区建起了不少水利改造工程，例如密西西比河、密苏里河及俄亥俄河及其支流上的大坝修建、截弯取直工程、河道重塑、河岸护堤工程和水土流失防控工程。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失