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81.
Typhoon hazards in the Shanghai area 总被引:1,自引:0,他引:1
There are three major typhoon hazards that apply to the Shanghai area. First, galeforce winds can damage buildings and service facilities. The most severe damage from this occurs only when a typhoon strikes Shanghai directly. Second, both the urban and rural sections of Shanghai are liable to flooding during typhoon seasons. These floods occur when typhoon-induced storm surges coincide with high spring tides and meet with high discharges from the river network as a result of the typhoon downpours. Third, typhoon-induced torrential rain has caused waterlog hazards, particularly in the most densely populated parts of Shanghai. The waterlog hazard has been exacerbated by land subsidence and poor management of pumping systems. In order to prevent disasters happening and reduce the scale of damage, the government has issued construction guidelines and invested in flood defences. Further measures are to be brought in including engineering projects, educational programmes and insurance policies. 相似文献
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Tong Zhang Xing Xie Hongying Hu Yudong Song Qianyuan Wu Zusheng Zong 《Frontiers of Environmental Science & Engineering》2008,2(3):380-384
Cryptosporidium and Giardia are two typical species of pathogenic protozoans that seriously endanger water quality. Previous works indicated that detection of Cryptosporidium and Giardia with modified United States Environmental Protection Agency (USEPA) method-1623 using a membrane filtration-elution for sample concentration attained better recovery and lower cost compared to the USEPA method-1623. Several improvements of membrane filtration-elution step as well as immunomagnetic separation (IMS) steps were investigated and an optimized method for detection of Cryptosporidium and Giardia in wastewater reclamation system was recommended in this paper. The experimental results show that an overnight soak of the membrane after scraping and vortex agitation before elution could enhance and stabilize the recovery. Increasing turbidity to 4 NTU by adding kaolin clay before filtration could effectively improve the recovery of low-turbidity water. Washing the concentrate after centrifugation and twice acid dissociation both reduced the impact of water quality to protozoan recovery. Protozoans in different water samples were determined by this optimized method, and the recovery of Cryptosporidium and Giardia were above 70% and 80% respectively, much higher than the acceptance of method-1623. 相似文献
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针对能源桩受温度作用影响时的承载特性难以量化,提出考虑径向温度效应的荷载传递法对能源桩热-力耦合作用下的受力特性进行研究,评估温度变化对能源桩的影响,研究桩身轴力、桩侧摩阻力的分布状态,并以昆山能源桩的现场测试为依托,验证了本文方法的可行性。计算结果表明,温度作用对能源桩桩身应力应变状态有显著影响,当桩体受极限荷载与温度作用时,侧阻力发挥的作用几乎不大,在降温作用下能源桩桩顶会产生残余变形,因此在能源桩设计时应以降温作用时的沉降值为标准进行折减,考虑能源桩的设计承载力。 相似文献
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本文通过腐蚀失重试验、腐蚀产物分析和交流阻抗谱研究了Q345R在不用的微量的两种小分子有机酸(甲酸和乙酸)中的常温25℃和液相高温85℃中腐蚀行为.根据试验结果可知,随着浓度的逐渐升高,Q345R在两种小分子有机酸腐蚀速率均有所升高,腐蚀产物逐渐增厚,腐蚀形貌未发生明显变化.根据电化学试验结果,在25℃环境温度下,小分子有机酸对Q345R的腐蚀剧烈程度随时间明显降低,并且表面吸附作用明显减弱.在85℃环境温度下,小分子有机酸对Q345R的腐蚀剧烈程度随时间变化不大,反应行为也未发生明显的变化.这说明在较高的温度下,随着反应激活能提高,扩散条件并非控制腐蚀反应的最主要因素,腐蚀行为也与较低环境温度下产生显著的区别. 相似文献
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建立了使用硅胶净化小柱净化、氮磷检测器检测水中阿特拉津的方法。结果表明,经过硅胶柱净化后的生活污水,基本消除基质干扰。采用具有氮磷检测器的气相色谱仪检测阿特拉津,其质量浓度在0.10~2.0 mg/L范围内线性良好,相关系数R2=0.999,方法检出限为0.2μg/L,测定下限为0.8μg/L。空白样品加标回收率为90.0%~93.5%,实际样品加标回收率为88.5%~90.3%,相对标准偏差均10%。该方法简单、快速、准确,可以消除阿特拉津测试中基质和同系物的干扰。 相似文献
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Continental‐Scale River Flow Modeling of the Mississippi River Basin Using High‐Resolution NHDPlus Dataset 下载免费PDF全文
Ahmad A. Tavakoly Alan D. Snow Cédric H. David Michael L. Follum David R. Maidment Zong‐Liang Yang 《Journal of the American Water Resources Association》2017,53(2):258-279
As a key component of the National Flood Interoperability Experiment (NFIE), this article presents the continental scale river flow modeling of the Mississippi River Basin (MRB), using high‐resolution river data from NHDPlus. The Routing Application for Parallel computatIon of Discharge (RAPID) was applied to the MRB with more than 1.2 million river reaches for a 10‐year study (2005‐2014). Runoff data from the Variable Infiltration Capacity (VIC) model was used as input to RAPID. This article investigates the effect of topography on RAPID performance, the differences between the VIC‐RAPID streamflow simulations in the HUC‐2 regions of the MRB, and the impact of major dams on the streamflow simulations. The model performance improved when initial parameter values, especially the Muskingum K parameter, were estimated by taking topography into account. The statistical summary indicates the RAPID model performs better in the Ohio and Tennessee Regions and the Upper and Lower Mississippi River Regions in comparison to the western part of the MRB, due to the better performance of the VIC model. The model accuracy also increases when lakes and reservoirs are considered in the modeling framework. In general, results show the VIC‐RAPID streamflow simulation is satisfactory at the continental scale of the MRB. 相似文献
90.
污水再生处理系统中隐孢子虫和贾第鞭毛虫检测方法的优化 总被引:7,自引:3,他引:4
隐孢子虫和贾第鞭毛虫是2种严重危害水质安全的病原性原生动物.与USEPA1623方法相比,以膜过滤-洗脱法作为浓缩方式的检测流程回收率较高且成本较低.本研究通过对膜过滤-洗脱环节和免疫磁性分离(IMS)过程进行改进和参数优化,建立了适用于污水再生处理系统的两虫检测方法.研究发现,对滤膜进行刮擦处理后隔夜浸泡,以及洗脱前剧烈振荡等操作能够显著提高并稳定回收率.投加高岭土浊液提高水样的浊度至4NTU更加有效地提高了低浊水样的浓缩回收率.离心浓缩后洗涤沉淀并进行2次酸解离是降低IMS过程水质干扰的有效措施.采用该优化方法对不同来源水样进行检测,隐孢子虫回收率超过70%,贾第鞭毛虫回收率超过80%,明显高于1623方法的接受标准(>24%). 相似文献