SGER: Estimating Damage to Urban Buried Infrastructure in the Aftermath of Hurricane Katrina

评估卡特里娜飓风过后对城市掩埋基础设施的损害Erez Alloche，David Hall，Raymond Sterling ABSTRACT广泛洪水泛滥的密集城区在北美是罕见的事件。因此，关于这类自然灾害对地下基础设施系统的影响的信息很少。在1997年红河洪水导致加拿大温尼伯市大福克斯和部分地区被淹后，有人认为超载对玻璃化粘土重力管道内压载荷的影响导致了广泛的裂缝。当水退去时，可能也会失去床铺支撑。然而，在洪水退去一年多之后才尝试收集数据时，很难清楚地确定洪水对下水道收集系统恶化的实际影响。卡特里娜飓风带来了美国现代史上最严重的洪水，包括新奥尔良市被淹没，新奥尔良市是一个拥有100万人口的主要大都市区。目前，还没有经过验证的工具来评估9万平方英尺地下基础设施网络所遭受的破坏。这一奖项将集中于收集洪水消退地区的时间敏感数据，如路易斯安那州的斯利德尔和密西西比州的比洛克西。将收集的数据包括使用闭路电视(CCTV)对地下管道系统的当前状况进行目视检查，对周围地面结构和基础设施的破坏，波前的最大高度和速度，洪水淹没受影响区域的深度和时间长度，以及垂直埋在地下的建筑物(如沙井)的状况。其他将收集的数据包括将被检查的管网的类型、直径、材料和年限，以及有关最近修复活动的信息，如管道衬里。该奖项旨在确定与飓风洪水波和长期洪水相关的非传统加载造成的损害机制。将仔细选择研究区域，以包括最近接受CCTVed(或接受其他条件评估调查方法)的地区，以便对飓风前后的情况进行量化。虽然实际检查将仅限于卫生和雨水下水道收集系统，但也将收集有关研究地区的水和天然气分配系统的数据。这项研究收集的具有时间敏感性的数据以及获得的与飓风相关的负荷相关的失效机制知识将作为加强当前设计和施工实践的基础。有关选定地下系统所受损害的定量数据将使我们能够更好地评估更广泛的飓风受灾地区所遭受的损害。因此，根据这项研究收集的信息和获得的知识将有助于墨西哥湾沿岸地区被掩埋的基础设施系统的重建工作，并有助于防止未来与洪水有关的故障。

SGER: Estimating Damage to Urban Buried Infrastructure in the Aftermath of Hurricane KatrinaErez Allouche, David Hall, Raymond SterlingABSTRACTWidespread flooding of a dense urban area is a rare event in North America. Thus, little information is available regarding the impact of such natural disasters on buried infrastructure systems. In the aftermath of the 1997 Red River flood, which resulted in the flooding of Grand Forks and portions of the city of Winnipeg, Canada, it was suggested that the effect of surcharge on the internal pressure loading in vitrified clay gravity pipes resulted in extensive cracking. When the water receded, loss of bedding support also was suspected to occur. However, when attempts to collect data were undertaken more than a year after the water receded, the actual impacts of the flood on the deterioration of the sewer collection system were difficult to clearly identify. Hurricane Katrina brought the most severe flooding in modern US history, including the submergence of the City of New Orleans, a one million strong major metropolitan area. At present, there are no proven tools for assessing the damage sustained by buried infrastructure networks in the 90,000 sq. mile hurricane-struck area.This award will focus on collecting time-sensitive data in areas where the water has receded such as Slidell, Louisiana and Biloxi, Mississippi. Data to be collected includes visual inspection of the current condition of underground piping systems using closed-circuit television (CCTV), damage to surrounding above ground structures and infrastructure, maximum height and velocity of the wave front, the depth and the length of time the water flooded the impacted area, and the condition of vertical buried structures such as manholes. Other data to be collected include the type, diameter, material and age of the pipeline networks that will be inspected and information regarding recent rehabilitation activities such as pipe lining. The award seeks to identify damage mechanisms due to non-traditional loading associated with hurricane flood waves and long term flooding. Studied areas will be carefully chosen to include areas recently CCTVed (or subjected to other condition assessment survey methods) to allow the condition before and after the hurricane to be quantified. While physical inspection will be limited to sanitary and storm sewer collection systems, data will be also collected on the water and natural gas distribution systems in the studied areas.The time-sensitive data collected in this study and the knowledge gained regarding the failure mechanisms associated with hurricane-related loading will serve as a basis for enhancement of current design and construction practices. Quantitative data on the damage suffered by selected underground systems will allow for better assessment of the damage to the wider hurricane-struck area. Thus, the information gathered and the knowledge gained under this study will contribute to the reconstruction efforts of buried infrastructure systems in the Gulf Coast area and to the prevention of flood-related failures in the future.