An experimental study of soil conservation using herbaceous plants in Majuli Island, Assam, India

A model experiment on soil conservation utilising the plantation of certain herbaceous plants in a selected stretch of Majuli, the largest riverine island in the world, was carried out. The plantation followed work to establish the proper inclination for the river bank. The soil erosion in the experimental site was reduced to only about 2% compared with about 15–20% in the previous years. All the four species selected for the present study had excellent soil binding capacity and were thus helpful in stabilizing the highly vulnerable soil in the flood plain areas of the region.     

高性能防腐蚀涂料GFT—1及在环保装备中的应用

本文概述了环保装备中严重的腐蚀问题 ,高性能防腐蚀涂料的发展及应用前景。介绍了高性能防腐蚀涂料GFT -1的特性及其在环保行业中的应用范例。     

浅论沙湾县荒漠生态区荒漠植被的保护与开发利用

沙湾县是以农业生产力支柱产业的地处准噶尔盆地南缘的半干旱荒漠内陆区域,区域内荒漠植物被较脆弱,随着经济与人口的快速增长及农、林、牧业的大发展、如何保护县域内荒漠生态区荒漠植被,更好的开发和利用这种资源、将是一个十分重要的研究课题。     

DEVELOPMENT OF A GIS‐BASED FLOOD INFORMATION SYSTEM FOR FLOODPLAIN MODELING AND DAMAGE CALCULATION1

ABSTRACT: This work presents a flexible system called GIS‐based Flood Information System (GFIS) for floodplain modeling, flood damages calculation, and flood information support. It includes two major components, namely floodplain modeling and custom designed modules. Model parameters and input data are gathered, reviewed, and compiled using custom designed modules. Through these modules, it is possible for GFIS to control the process of flood‐plain modeling, presentation of simulation results, and calculation of flood damages. Empirical stage‐damage curves are used to calculate the flood damages. These curves were generated from stage‐damage surveys of anthropogenic structures, crops, etc., in the coastal region of a frequently flooded area in Chia‐I County, Taiwan. The average annual flood damages are calculated with exceedance probability and flood damages for the designed rainfalls of 2, 5, 10, 25, 50, 100, and 200 year recurrence intervals with a duration of 24 hours. The average annual flood depth in this study area can also be calculated using the same method. The primary advantages of GFIS are its ability to accurately predict the locations of flood area, depth, and duration; calculate flood damages in the floodplain; and compare the reduction of flood damages for flood mitigation plans.     

SHOULD DAMS BE MODIFIED FOR THE PROBABLE MAXIMUM FLOOD?1

ABSTRACT: The probable maximum flood (PMF) currently serves as the design standard for many U.S. dams. Floods used for design have increased and currently thousands of dams in the U.S. would be overtopped and possibly fail using the latest calculated PMF at each dam site. Some researchers have suggested that modifying dams to accommodate the PMF could be wasteful. Objections to using the PMF for dam modification include: (1) larger spillway capacity may increase annual downstream flood losses, (2) benefit‐cost ratios may be low, (3) construction accidents associated with dam modification may cause fatalities, and (4) the dollar amount spent to save lives by making dams safer is often very high. Based on these objections, a procedure is presented for evaluating the effectiveness of a proposed dam modification. A change in spillway design policy is recommended. Accepting the status quo at a dam that cannot accommodate the PMF may be the best course of action.     

AFTER THE 1993 FLOOD: A WATER AND SURFICIAL BED SEDIMENT QUALITY SCENARIO ON THE ILLINOIS AND UPPER MISSISSIPPI RWERS1

ABSTRACT: Effects of the 1993 flood on river water and sediment quality were investigated using historical data and data collected from the Illinois River and Upper Mississippi River in a post‐flood period. Overall the post‐flood results showed systematic reductions and individual changes in the water and sediment constituents. The reductions in sediment metals and nutrients were most obvious at the Keokuk and Lock and Dam 26 stations. By analyzing and comparing the physical changes to the changes in water and sediment constituents at each station, it was found that physical processes such as sediment entrainment and, more importantly, the removal of fine sediment to be the main causes for the reduced concentrations in sediment constituents. On the other hand, sediment redistribution and associated secondary contamination could have caused the emergence of several water and sediment constituents that were undetected before the flood.     

转炉二次烟气除尘采用电除尘器防爆的可行性

通过分析转炉一次烟气除尘、二次烟气除尘的工艺和烟气成分,论述了转炉二次烟气采用电除尘器除尘不会发生CO爆炸,论证了转炉二次烟气除尘采用电除尘器是可行的。     

环保产业的战略价值与调控激励机制探讨

环保产业对人类社会的持续协调发展具有巨大的价值贡献 ,是战略性产业。人们应借鉴国际经验并结合国情 ,建立我国环保产业有效的调控激励机制 :从加强环保产业的驱动因素入手 ,制定有效的产业扶植政策 ,加强技术创新 ,构筑环保产业大市场格局 ,促进环保产业向深层次快速发展。 更多还原      

减压塔规整填料腐蚀现状与防护

介绍了减压塔规整填料腐蚀的现状,阐述了介质温度、流速、腐蚀介质种类和填料尺寸等因素对规整填料腐蚀的影响,提出了改变工艺、加注缓蚀剂、改变材质和加强腐蚀检测等防护措施。     

开发建设中生态保护与恢复标准的技术要求及其确定方法初探

在阐述开发建设中生态保护与恢复标准的技术要求涵义和构成要素的基础上,对其规定方式和确定要求的工作程序、原则与方法进行了探讨。技术要求的规定方式包括定量方式和定性方式,其中定量方式又包括规定指标限值、规定指标限值的计算方法、规定参照系和规定指标的设计保证率4种。技术要求的确定可按如下程序进行：（1）分析开发建设活动的技术环节;（2）分析开发建设活动的生态影响;（3）确定生态保护与恢复主题;（4）确定生态保护与恢复的技术要求。确定技术要求时,应遵循以下原则：（1）技术和经济因素相结合;（2）体现自然地理条件的差异;（3）考虑历史情况。技术要求的确定可以有以下5种方法：（1）实践经验与科学试验总结法;（2）借鉴相关标准法;（3）借鉴国外同类标准法;（4）推理分析法;（5）基于生态质量要求的理论计算法。