丹江口工程左岸连接坝段三维动力响应分析

丹江口工程是南水北调中线工程的水源工程。左岸连接段混凝土重力坝与土石坝呈正交连接，是典型的三维问题。过去只作过平面分析。为了确保该工程的安全，又进行了三维动力分析。应用子空间迭代法解动力方程的特征方程，得出坝体的自振频率和振型；然后进行反应谱分析，得出地震荷载和坝体各振型的应力响应；最后把各振型的应力响应进行组合，得出坝体的最大应力响应。库水与坝体的相互作用是在上游坝面引入附加质量来考虑的。为了评     

龙潭水电站大坝可利用基岩面的确定

龙潭水电站确定大坝可利用基岩面是在查明水文地质、工程地质条件,找出影响可利用基岩面的几个主要因素后,根据坝基岩体声波测试及室内、外岩(石)体物理力学试验成果,并结合高薄拱坝不同高程岩体的受力特点提出来的。     

关注大坝对流域环境的影响

大坝是人类战胜自然的象征，它在蓄水、防洪、供水、灌溉、发电、航运等方面对人类社会发展起到了重要保障作用。由于筑坝，现在世界上的许多大江河差不多都变成了水库塔起来的台阶，彻底改变了河流自然的季节汉量模式，引起河水的温度和和化学成分变化；将河谷生命网络间的联系切断，使生物多样性减少；搅乱了河流的侵蚀、搬运和沉积地质作用过程，引起河岸滑塌，而且诱发水库地震；拦住了淤积洪泛平原与入海的沉积物，使河道形态发生变化，对流域生态环境严重的影响，甚至破坏。     

水口水电站坝基析出物的成因解析

从水口水电站大坝的安检中发现,坝基灌浆廊道、排水廊道部分排水孔出现黄色、白色等析出物。本文从工程地质及水文地质条件着手,经过大量的统计分析、取水样及析出物样进行试验,结合坝基的构造分布,总结了析出物的成因、形成机制及其对坝基的影响,为评价坝基的安全性提供了依据。     

东北电网混凝土坝变形监测精度分析

采用回归分析中标准差方法,对东北电网混凝土坝变形监测的精度进行估算,发现有的监测方法尚达不到有关规范的要求,并提出一些改进意见。     

The rural–urban equity nexus of Metro Manila’s water system

ABSTRACT

This article examines equity concerns and inherent conflicts related to rural–urban water supply allocation and use, with focus on Metro Manila. Going beyond the much-discussed difficulty farmers experience from an allocation policy prioritizing urban water requirements, it shows that inequity in raw water allocation is linked to, and further exacerbated by, inequities in urban domestic water provision. Moreover, it highlights the need for broader equity reviews, using the concept of the rural–urban water equity nexus to draw attention to key equity considerations across space and scale that otherwise might remain invisible.     

Evaluation of the environmental impact assessment (EIA) of Chinese EIA in Myanmar: Myitsone Dam,the Lappadaung Copper Mine and the Sino-Myanmar oil and gas pipelines

The economic relationship between China and Myanmar is regarded as a win–win cooperation. However, Chinese investments, especially in extractive and natural resource sectors, are associated with a number of unwanted environmental consequences. Moreover, the environmental impact assessment (EIA) quality of Chinese enterprises has often been criticized. EIA identifies adverse impacts to the environment through evidence-based decision making. On this basis, this paper provides an evaluation of Chinese EIA performance within the natural resources sector through a structured review of 15 environmental impact statements (EISs). This research also evaluates the EISs of the three largest and most controversial projects, the Myitsone Hydropower Dam, Lappadaung Copper Mine and Sino-Myanmar oil and gas pipelines. The findings reveal several omissions, inadequacies and deficiencies in all the projects with a significant number of EISs falling short of satisfactory quality. Through the analysis, the paper summarizes the factors affecting the EIA performance and proposes feasible recommendations to improve EIA practices in Chinese development projects in Myanmar.     

高混凝土拱坝长期安全运行反馈分析

以李家峡大坝为例,总结分析高混凝土拱坝长期运行中坝基变形偏大、左右1/4拱变形不对称、左右2087高程扬压力异常和地温较高等4方面典型现象,结合高水位原型试验、综合原型观测资料正分析、反演分析和有限元分析,并借助规律分析、关联分析和归纳总结等手段,综合判断李家峡大坝的工作性态。结果表明:李家峡大坝坝体水平位移变化规律总体正常,大坝运行状态良好,设计论证分析正常,大坝基础经处理后,满足安全的要求,具备足够的超载安全度。     

Assessment of hydrologic alteration induced by the Three Gorges Dam in Dongting Lake,China

Water‐level variations are an internal aspect of lake ecosystems that play a key role in structuring aquatic diversity and providing ecosystem services. In this study, the hydrologic alteration of Dongting Lake induced by the Three Gorges Dam (TGD) was assessed using indicators of hydrologic alteration and range of variability approach. The results demonstrate a declining trend in autumn water level (0.52–2.26 m) and 5–35 days' advancement for date of minimum annual water level because of the impound of water by the TGD in early autumn. The spatial patterns in the degree of the indicators of hydrologic alteration were different among the sub‐lake regions. Annual minimum water level and timing of annual extreme water level suffered a high degree of alteration in the eastern part of the lake, whereas autumn water level, date of minimum water level, and number of reversals in the western part of the lake showed a high degree of alteration. The average integrated degree of hydrologic alteration (D₀) for Dongting Lake was 50.40%, indicating that the hydrologic regime suffered a moderate alteration. The most ecologically relevant hydrologic indicators are critical for understanding eco‐hydrology. On the basis of principal component analysis, the five selected ecologically relevant hydrologic indicators were 90‐day minimum, date of minimum, high pulse duration, date of maximum, and May water level. Further studies are required to understand the impact of the TGD on water conditions in Dongting Lake, especially related to the response of the aquatic ecosystem.     

谟武水电站砼围堰控制爆破拆除

通常采用控制爆破拆除砼围堰。本文介绍了谟武水电站砼围堰控制爆破拆除的经验,施工中解决了钻孔、装药、网路联接时出现的问题,爆破获得圆满成功,拆除砼６７６５ｍ３。