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城市防洪工程是城市建设的根本保障,是城市建设中的一部分,新的城市规划设计理念,同时为城市防洪工程设计赋予新的观念,把防洪工程融合到城市规划建设中,与城市建设相一致,使城市防洪工程设计与城市规划设计相协调,做到景、防结合的统一。 相似文献
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我国水利工程建设自1996年全面推行建设监理制以来,取得很大成绩,但迄今为止,建设实施阶段以前的前期工作监理(包括设计监理)开展尚不普遍,为此提出水利工程设计监理的问题,论述了水利工程前期工作阶段(即:可行性研究阶段、初步设计阶段、施工准备阶段)进行设计监理的必要性、设计监理的性质、特点、设计监理的主要内容、对设计监理单位及设计监理人员的要求,并提出了推行设计监理的意见. 相似文献
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随着节水型社会建设的深入推进,灌区建设亟需提高水资源利用效率,现就灌区改造提升工程建设,介绍设计中的流量设计、断面设计等,与类似工程建设设计同仁进行交流、探讨. 相似文献
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本文以河流穿过城镇区域的防洪工程设计为出发点,以适应现代城镇化建设对防洪要求为基础。以保持河道的自然属性和生态功能,根据城镇建设景观规划及水景观建设要求为条件。结合莲河东丰县城区段防洪工程的设计实例,阐述了城镇区河段堤防的设计标准,对旧堤防加固、改线、重新筑堤等方案的设计,考虑了镇区的交通、排涝、景观、环境对堤防建设的要求,使得堤防设计达到相应标准,以此仅供水利设计工作者参考。 相似文献
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In this study, analytical and semi-analytical solutions are derived to delineate capture zone of a pumping well near a stream where a leaky layer exists between the aquifer and the stream. A groundwater regional flow is considered in the aquifer and allowed to have different angles with respect to the stream axis. Three critical pumping rates are introduced. At the first pumping rate, capture zone boundary tangents the interface between the aquifer and the leaky layer; called the in-homogeneity boundary. At the second pumping rate, capture zone boundary tangents the stream boundary and if the rate is increased, a part of pumped water would be withdrawn from the stream. The third pumping rate, which may be smaller or larger than the other two, is defined as the rate at which stream water begins to enter the leaky layer; it may or may not be captured by the pumping well. Four different capture zone configurations (cases) are analyzed for different values of pumping rates, groundwater flow directions, and leaky layer’s thickness and hydraulic conductivity. The first three cases analyze hydraulic situations whereby capture zone does not reach the stream, and hence, no pumped water is withdrawn from the stream. With the lowest pumping rate in the first case, no stream water enters the leaky layer. It enters the leaky layer but not the aquifer in the second, and enters the leaky layer and the aquifer in the third case. In the fourth case, where capture zone boundary intersects the stream, the fraction of pumped stream water to total pumped water is delineated. 相似文献
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The distinction between a “stream” and “river” is imprecise and vague despite the popular usage of the terms across disciplines for describing flowing waterbodies. Based on an analysis of named flowing waterbodies in the continental United States, we suggest a bank-to-bank channel width of 15 m as a working threshold in defining smaller “streams” from larger “rivers.” 相似文献
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台阶形陆架上孤立波传播的数值模拟 总被引:2,自引:0,他引:2
为了研究孤立波在带有陡升台地的陆架上的传播,用MAC方法求解了二维纳维尔-斯托克斯方程。本文在以下几点,改进了东京大学提出的修正的网格标记法:1.给出交错网格的新的标号系统;2.推导出自由表面上非规则星的新的压力迭代公式;3.对流函数、压力和速度使用了三值悬旗;4.把一维Burgers方程的部分守恒形式扩展用于二维N-S方程。这些使得程序更简单和精确。计算结果证卖,物理上很好地解释了孤立波的传播,入射波分成了反射波和透射波,然后开始分裂、破碎。 本文计算结果与线性波理论的结果很一致,但后者不能给出波运动的过程。 相似文献
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T. Kh. Akhmedov B. K. Nurkin A. T. Nurseitov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1991,25(9):536-539
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 16–19, September, 1991. 相似文献