同济大学：《地质工程导论》课程电子教案（课件讲稿）Chapter VII Review on current status and challenging issues of land subsidence in China（Part I）

CHAPTER VII:Review on current status and challenging issues of land subsidence in China (Part I)

CHAPTER VII: Review on current status and challenging issues of land subsidence in China (Part I)

Land Subsidence and Flooding in Bangkok In the last thirty years,the area affected by land subsidence in the Bangkok Metropolitan Region (i.e. City of Bangkok and sur-rounding region)has grown to more than 4,550 km2 in size,with maximum subsidence in many localized regions exceeding 1600 mm.the extremely flat and low-lying nature of the terrain,together with differential ground subsidence, renders the region very susceptible to excessive flooding.Unless corrective action is undertaken,the situation will continue to deteriorate,and the socioeconomic penalties will also continue to mount

Land Subsidence and Flooding in Bangkok • In the last thirty years, the area affected by land subsidence in the Bangkok Metropolitan Region (i.e. City of Bangkok and sur-rounding region) has grown to more than 4,550 km2 in size, with maximum subsidence in many localized regions exceeding 1600 mm. the extremely flat and low-lying nature of the terrain, together with differential ground subsidence, renders the region very susceptible to excessive flooding. Unless corrective action is undertaken, the situation will continue to deteriorate, and the socioeconomic penalties will also continue to mount

New words and phrases Land subsidence地面沉降 differential sinking不均匀沉降 terrain地面 tectonic motion构造运动 ores矿石 extraction采掘 withdrawal of groundwater地下水开采 cavern洞穴 disastrous phenomena灾难性事件 utility lines cracking公用电断电

New words and phrases Land subsidence 地面沉降 differential sinking 不均匀沉降 terrain 地面 tectonic motion 构造运动 ores 矿石 extraction 采掘 withdrawal of groundwater 地下水开采 cavern 洞穴 disastrous phenomena 灾难性事件 utility lines cracking 公用电断电

New words and phrases seawater intrusion海水入侵 civil infrastructures基础设施 densely populated人口密集的 deltaic regions河流三角洲地区 measurement测量 monitoring监控 remediation补救 symposia专题报告会 coastal regions沿海地区 the coastal plain and river delta regions沿海平原和河流三角洲地区

New words and phrases seawater intrusion 海水入侵 civil infrastructures 基础设施 densely populated人口密集的 deltaic regions 河流三角洲地区 measurement 测量 monitoring 监控 remediation补救 symposia 专题报告会 coastal regions 沿海地区 the coastal plain and river delta regions沿海平原和河流三角洲地区

New words and phrases the plain regions in front of major mountains山前平原地☒ regions in valleys and basins among mountains山间河谷和盆地地区 accumulative subsidence累积沉降量 rebound回弹 wire flex extensometers可压缩的变形监测仪 clays粘土 loams亚粘土 lithological岩性的 Pliocene上新统的 Ground cracks地裂缝 elevation海拔

New words and phrases the plain regions in front of major mountains 山前平原地区 regions in valleys and basins among mountains山间河谷和盆地地区 accumulative subsidence 累积沉降量 rebound 回弹 wire flex extensometers 可压缩的变形监测仪 clays 粘土 loams 亚粘土 lithological 岩性的 Pliocene 上新统的 Ground cracks 地裂缝 elevation 海拔

New words and phrases floodgate防洪闸 breakwater防波是 storm tide风暴潮 hydrological unit水文单元

New words and phrases floodgate 防洪闸 breakwater 防波堤 storm tide 风暴潮 hydrological unit 水文单元

1.Introduction Land subsidence can be defined as the differential sinking of the ground surface with respect to surrounding terrain or sea level.Land subsidence can result from natural causes such as tectonic motion and sea level rise or man-induced causes such as the withdrawal of groundwater,oil and gas,the extraction of coal and ores and the underground excavation for tunnel and cavern.Land subsidence is usually observed as a series of disastrous phenomena

 Land subsidence can be defined as the differential sinking of the ground surface with respect to surrounding terrain or sea level. Land subsidence can result from natural causes such as tectonic motion and sea level rise or man-induced causes such as the withdrawal of groundwater, oil and gas, the extraction of coal and ores and the underground excavation for tunnel and cavern. Land subsidence is usually observed as a series of disastrous phenomena. 1. Introduction

Examples Examples of these phenomena are underground utility lines cracking,seawater intrusion and settlements of buildings and civil infrastructures. Therefore,land subsidence is one of the challenging issues that need to be addressed in many countries including Australia,China,Egypt,France,Germany, India,Iran,Israel,Italy,Japan,Mexico,Poland,Saudi Arabia,Sweden,the Netherlands,UK and USA

 Examples of these phenomena are underground utility lines cracking, seawater intrusion and settlements of buildings and civil infrastructures. Therefore, land subsidence is one of the challenging issues that need to be addressed in many countries including Australia, China, Egypt, France, Germany, India, Iran, Israel, Italy, Japan, Mexico, Poland, Saudi Arabia, Sweden, the Netherlands, UK and USA. Examples

Examples Land subsidence has occurred in many areas, particularly in densely populated deltaic regions throughout the world.Most of the major subsidence areas have developed probably since World War ll because of accelerated rates in the use of water and oil and gas from the ground

 Land subsidence has occurred in many areas, particularly in densely populated deltaic regions throughout the world. Most of the major subsidence areas have developed probably since World War II because of accelerated rates in the use of water and oil and gas from the ground. Examples

It was reported in 1995 that there were more than 150 major cities in the world where subsidence were substantial (Barends et al.,1995,1998).Because of the wide distribution of land subsidence and its severe consequence to environment and economy, land subsidence has been one of the topics needing research and technology transfer at the international level

 It was reported in 1995 that there were more than 150 major cities in the world where subsidence were substantial (Barends et al., 1995, 1998). Because of the wide distribution of land subsidence and its severe consequence to environment and economy, land subsidence has been one of the topics needing research and technology transfer at the international level