ASSESSING FLOOD MITIGATION ALTERNATIVES IN SHIJR AREA IN METROPOLITAN TAIPEI1

The Keelung River Basin in northern Taiwan lies immediately upstream of the Taipei metropolitan area. The Shijr area is in the lower basin and is subject to frequent flooding. This work applies micromanagement and source control, including widely distributed infiltration and detention/ retention runoff retarding measures, in the Wudu watershed above Shijr. A method is also developed that combines a genetic algorithm and a rainfall runoff model to optimize the spatial distribution of runoff retarding facilities. Downstream of Wudu in the Shijr area, five dredging schemes are considered. If 10‐year flood flows cannot be confined in the channel, then a levee embankment that corresponds to the respective runoff retarding scheme will be required. The minimum total cost is considered in the rule to select from the regional flood mitigation alternatives. The results of this study reveal that runoff retarding facilities installed in the upper and middle parts of the watershed are most effective in reducing the flood peak. Moreover, as the cost of acquiring land for the levee embankment increases, installing runoff retarding measures in the upper portion of the watershed becomes more economical.     

INVESTIGATION OF TURBIDITY MAXIMUM IN A MESOTIDAL ESTUARY,TAIWAN1

ABSTRACT: To comprehend the distributions of salinity, temperature, and suspended sediment in the Danshuei River estuary in Taiwan, monthly field surveys were conducted in 2003. These included several high and low slackwater surveys and intensive surveys. The results show that the Danshuei River estuary is predominately a partially mixed estuary. The highest concentration of suspended sediment is typically observed at the Chung‐Hsin Bridge, the most upstream sampling station. The suspended sediment concentration exhibits a general decreasing trend in the downstream direction. It may be concluded that the sediments mostly come from the upstream reach. A locally high concentration of suspended sediment is found at the Kuan‐Du station because of the local deep channel bathymetry and two‐layered estuarine circulation. A vertical two‐dimensional hydrodynamic and sediment transport model is applied to investigate the tidally averaged salinity distribution, residual circulation, and suspended sediment concentration. The modeling results reveal that, under the Q₇₅ flow condition (i.e., low flow), a turbidity maximum occurs at the Kuan‐Du station due to the strong estuarine circulation. The model simulation with a much higher river flow condition results in a weaker residual circulation and weaker turbidity maximum.     

利用造纸黑液制备水煤浆添加剂

利用造纸黑液中有效成分，经过适当处理制备水煤浆添加剂，并且对添加剂的性能进行了测试。结果表明，依照该工艺生产的添加剂，性能优良，能够满足工业生产需要。     

CAF涡凹气浮处理含油废水的中试试验研究

针对石化公司污水成分复杂,COD和油含量较高,还含有较多的硫化物、挥发酚和氨氮(NH3-N)等情况,选用一种新型的气浮设备CAF涡凹气浮系统对该含油废水进行了预处理中试试验。试验结果表明CAF处理石化含油废水效果明显,气浮处理效果好,出水油在10 mg/L以下,去除率高达95%,且CAF气浮的电耗小、占地面积小、操作管理和维修非常简便。采用CAF设备,占地面积可节省70%～80%,每年可节约电费50～60万元(按1000 m3/h,0.8元/kW·h),操作使用也极其简单,具有可观的经济效益。     

浅谈新时期安全监察工作

通过分析两个阶段的安全管理方法 ,说明传统管理沿用的原因 ,为做好现代化科学管理提出了几点探索性意见     

城市生活垃圾综合处理前分选系统设计

本文以江油市城市生活垃圾处理厂为工程实例,介绍了垃圾前分选系统中的垃圾储料车间、行车与抓斗、垃圾上料机构、双层振动筛以及人工分选平台的工艺设计参数及设计依据,并在此基础上提出了该系统的改进建议.     

用蒽醌生产中的废硫酸制备硫酸钾

研究了以蒽醌生产中的废硫酸为原料,通过缔合,置换,解缔等步骤,制备硫酸钾的最佳工艺条件。在最佳条件下,可使废硫酸中Ｈ２ＳＯ４的质量分数从２３％降至０．６０％,废硫酸成盐率为８９．０１％,硫酸钾纯度为９５．８５％。     

城市生活垃圾的生命周期管理

根据国际标准化组织１９９７ 年颁布的ＩＳＯ１４０００ 环境管理体系“生命周期评价—原则与框架”,本文对可持续城市生活垃圾生命周期管理进行研究,指出城市生活垃圾应在环境可持续性、经济可负担性及社会可接受性的原则基础上,通过垃圾的减量化、无害化、资源化和社会化管理,实现城市可持续发展的管理目标     

伊朗加恩—贝尔兼德地震结构震害概述

对１９９７年５月１０日伊朗东部加恩－贝尔兼德地震中出现的几类结构的震害现象进行了初步的描述与分析,同时,就经抗震设防与未防抗震设防结构的震害现明作了对比。对震区重建及附近地区新建结构抗震问题的解决有一定的参考意义。