The yellow river water environment information management system is a computer network system covering the whole basin , the construction of which includes a computer network construction and software development . the software involves database , gis , and man - machine interface . the investment in the system is huge and the period of construction is long , thus , a good design is very important . the design schemes are summarized in this paper . according to the present computer technology , some new methods used in network design and software development are introduced , and it is suggested that expandability and opening of the system should be considered in system construction 黄石?水电站输水渠道地处地质结构比较复杂的地方,由于渠道建成投运的时间较早,且原设计的标准较低,糙率较大.在电站机组已更新改造的情况下,若不进行输水渠道挖潜改造,已难于满足电站机组的设计流量要求.经反复比较,决定采取减小渠道糙率的方案,对输水渠道进行三面光护面加固防渗,增加过流,效果很好
In this thesis , first , reasons and factors for the stability of loose rock dams were summarized according to the field surveys and certain expert ' s experiences . then , researches on block stability problems were reviewed , and according to the relationship between grain size and incipient velocity , it is found that the block weight is in direct proportion to 6 - 9 power of incipient velocity , and 50 % increase of the velocity will result in about 40 times change of the block weight . after that , experiments were conducted in a flume , focusing on the relationship between incipient velocity and some main factors including block weight , water depth over the dam , cross - section size , block material and river bed material 本文首先根据散抛石坝损毁情况的现场调查资料，结合有关专家多年的整治经验，总结出坝体的损毁原因及影响因素；对现有块体稳定性的研究成果进行回顾和总结，并针对散抛石坝的直接损毁现象，结合山区河流的水流、地形特点，利用块体粒径与起动流速的关系，提出块体稳定重量与起动流速高次方成正比的概念，流速50的增长可能导致块体稳定重量接近40倍的变化；通过二维变坡水槽试验，研究了坝体稳定的主要影响因素，包括块体重量、坝顶水深、断面尺寸、块体材料(块石和卵石两种) 、护底等，结果表明对于山区河流，试图仅仅通过增加坝体单个块体重量或断面尺寸来提高坝体稳定性效果甚微；最后，根据西部地区的自然、经济、交通等条件，提出可以采用柔性混凝土铰链体等一类整体性较好的护面层作为散抛石坝的防冲毁措施，以期取得良好的工程效果。
Taken the bank spillway at yubeishan reservoir as an example , the water loads acted on the spillway , such as static water pressure , dynamic water pressure , shear stress on the surface of the step and so on , are calculated , which can provide evidence to the stability analysis of the dam slope and slope protection 并以万县鱼背山水库岸边溢洪道为例，计算了溢洪道上所受的水流荷载及其分布，为土石坝坡和护面的稳定分析提供了依据。通过计算证实了既使在较大的单宽流量下，缓坡上的阶梯仍有较高的消能率。
From the engineering practice in instability and failure of protective facing of overflow rock fill cofferdam , this article discussed the causes of formation of instability and failure of wire - caged protective facing and analyzed the primary factors and critical conditions of instability and failure based on model experiments 摘要从过水堆石围堰护面失稳破坏的工程实践出发，探讨了铅丝笼护面失稳破坏的成因，在模型试验的基础上，分析了影响铅丝笼护面稳定的主要因素及失稳破坏的临界水力条件。
The result is basically agreed with the calculations and can verified the theory for the stability of earth - rock dams under flood discharge , in the second part of this paper , several kinds of slope - protection materials are studied . according to the material property , a type of new flexible slope - protection material applied to overflow earth - rock dams - rubber panel armoring - is presented 为了研究高土石坝在大单宽流量下的稳定性，本文第二部分主要对几种不同的土石坝护面材料进行了探讨，根据材料的特性和各自的受力特点，提出选用一种新型的柔性护面材料?橡胶板作为土石坝的防护材料。
