造林整地排水产生水土流失及其防止措施

造林整地排水产生水土流失及其防止措施［英］Ｐ．Ａ．ＣａｒｔｉｎｇＭ．Ｓ．ＧｌａｉｓｔｅｒＴ．Ｐ．Ｆｌｉｎｔｈｅｍ１引言英国高地造林整地的常规方法是采用顺坡和横坡开沟相结合的办法进行翻耕排水。现已制订有森林排水网路的设计准则及河道管理准则，遵循这些准则...     

Use of climate scenarios to aid in decision analysis for interannual water supply planning

This work addresses the issue of climate change in the context of water resource planning on the time scale of a few years. Planning on this time scale generally ignores the role of climate change. However, where the climate of a region has already shifted, the use of historical data for planning purposes may be misleading. In order to test this, a case study is conducted for a region, the Australian Capital Territory, where long term drought is raising concerns of a possible climate shift. The issue is cast in terms of a particular planning decision; the option to augment water supply in the next few years to hedge against the drought persisting. A set of climate scenarios are constructed for the region corresponding to the historical climate regime and to regimes where progressively greater levels of change are assumed to have already taken place (5%, 10%, 20% reductions in mean rainfall). Probabilities of the drought persisting are calculated for each of the scenarios. The results show substantial increases in the probability of the drought persisting for even moderate reductions in mean rainfall. The sensitivity of the decision to augment supply to the scenario results depends ultimately on the planners tolerable thresholds for the probability of the drought persisting. The use of different scenarios enables planners to explore the sensitivity of the decision in terms of their risk tolerance to ongoing drought and to their degree of belief in each of the scenarios tested.     

南水北调卢沟桥暗涵工程混凝土碱骨料反应及预防措施

碱骨料反应是混凝土工程的重大隐患之一，卢沟桥暗涵工程根据其反应机理，采取相应预防措施，以确保工程质量，提高暗涵工程的耐用性。     

大禹渡扬水工程枢纽沉沙池存在问题原因分析及对策

大禹渡扬水工程枢纽沉沙池是解决枢纽二级站水泵磨损及灌区渠道淤积的关键工程。现沉沙池沉沙效率低下，严重制约了灌溉效益的发挥。本文从沉沙池的建造历史、工程地质、池身结构、泥沙淤积等方面对沉沙池存在的问题进行了综合分析。     

Monitoring water quality in reservoirs with IRS-1A-LISS-I

An attempt has been made to quantify the relationship between the variation in IRS-IA-LISS-I (Indian Remote Sensing Satellite-1A Linear Imaging Self-Scanning System) radiance data and field measured change in secchi disc depth. Secchi disc depth was measured for 47 predetermined sampling locations on reservoir surface water. At extinction depth (secchi depth), water samples were collected from all the sampling locations. Suspended sediments of eight locations representing various reaches of the reservoir were selected for mineralogical, particle size and optical properties analysis. The LISS-I radiance value in band 1 (0.45–0.52µm) band 2 (0-52–0.59 µm) and band 3 (0.62–0.68 µm) were used in a regression analysis. The absorption infrared band 4 (0.77–0.86 µm) was not included in the analysis. In these, the dependable variable was secchi depth (SD) and the LISS-I-radiance data was the estimator variable. Forty-seven data sets of 20 October 1988 from Tawa reservoir surface water were used to obtain an estimator equation for SD. The verification of the estimator equation was tested by applying it to a data set of 21 measurements of 28 September 1988 for this reservoir. The coefficient of correlation between observed and estimated values for the 28 September 1988 data set wasr=0.92 for SD, indicating that the equation could accurately predict the water clarity (SD) for this reservoir on new occasions from IRS-IA-LISS-I spectral data. It is shown that mineral composition and optical properties of suspended sediments influence the reflected radiance of water quality. It is concluded that IRS-IA-LISS-I data provide a useful means of mapping water quality in reservoir.     

西气东输工程用感应加热弯管技术条件探讨

在对国外X70管线弯管技术条件进行调查分析与研究的基础上，对其中的几个关键技术问题包括母管成分，弯管的制造工艺和技术路线，强度与韧性要求，屈强比，Cu污染问题等进行了讨论。一些观点在西气东输感应加弯管技术条件中得到应用。     

论项目管理对投资效益的支持作用

投资活动具有独特的运行规律，政府和企业在管理模式上现存的缺陷不利于投资效益的实现，有必要在实际 工作中引入项目管理的模式，项目管理以效益为直接目标，以项目为核心，以竞争为手段，以协调为基础，以法律为保障，辅以现代化的项目管理方法和技术，为投资效益的实现铺垫了良好的基础，具有坚实的支撑作用。     

新干县蓄水工程灌溉水费征收探讨

对江西省新干县蓄水工程灌溉水费征收问题进行探讨，并提出了一些建议和对策。     

浅析南水北调工程对河北省受水区生态环境的影响

南水北调工程的实施将缓解河北省长期缺水的严重局面,对其生态环境产生显著影响。该文从社会经济、气候环境、水环境、土壤、地质环境以及水生生物等多个层面分析了南水北调工程对河北省受水区生态环境的影响,为合理利用来水,保护和改善河北省生态环境及促进河北经济的持续稳定发展提供依据。