南水北调丹江口大坝加高工程水下埋件检测施工技术

介绍了水下埋件检测施工技术,对施工质量和安全控制要点进行了分析和总结。水下埋件检测的方法和要求,为水工金属结构安全检测技术规范的完善提供了依据,为水电站金属结构闸门水下埋件的检测提供了经验。

门槽埋件水下检测技术分析

闸门埋件检测对于大坝安全运行意义重大,水下埋件检测特别是高水头条件下埋件检测施工一直是个难点,丹江口水下埋件检测施工,针对门槽埋件检测特点,设计了专用检测平台(或船只),人员检测路线。介绍了水下门槽埋件检测的施工技术,包括施工顺序、施工方法、施工设备及质量安全措施,并针对埋件锈蚀特点提出修复建议。

复杂边界条件下巨型分瓣式座环吊装技术研究

指出了大藤峡水利枢纽工程由黔江主坝、黔江副坝和南木江副坝组成。左岸厂房布置了3台单机200WM轴流转浆式水轮发电机,水轮机厂家为浙富股份有限公司,发电机厂家为哈尔滨电机厂有限责任公司。水轮发电机组水下埋件包含尾水肘管、锥管、座环和转轮室,其中座环由上环、下环和24只固定导叶焊接而成,座环净重重量434.58t,整体高度5240mm,外径Φ17120mm,座环分8瓣。最大瓣外形尺寸为6617mm×2569mm×5240mm,净重55.633t。合同招标文件座环分6瓣,单瓣最重30t,实际座环共分8瓣,单瓣重量达55.633T。简述了大藤峡座环的结构特征、吊装方案比选,根据施工现场实际情况,科学分析了座环吊装设备选型,为巨型分瓣式座环吊装提供借鉴。

RS-based research on the relationship between vegetation development and groundwater in upper-middle reaches region of the Yellow River basin

The relationship between the groundwater and the surface eco-environment in arid area is very close. In this paper, the authors extracted normalized difference vegetation index （NDVI） and vegetation conditional ratio （VCR） from MODIS images, and analyzed the relationships among NDVI, VCR and the measured data of groundwater of the same location in the research region. Based on this, the depth of groundwater suitable for vegetation growth in the upper-middle reaches of the Yellow River basin has been calculated. The results show that the depth of groundwater suitable for vegetation growth in the research region ranges from 0.8 to 4.5m, and the optimal groundwater depth is 1.2m. The method developed in this study is applicable to research the relationship between the groundwater and land surface vegetation environment on large-scale in arid area.