Risk Assessment on Rainstorm Waterlogging of Tianjin Binhai New Area Based on Scenario Simulation
Received date: 2011-08-09
Request revised date: 2011-10-12
Online published: 2012-07-20
Copyright
Natural disaster is the hotspot question in international society and academy. Coastal cities are important areas and strategic focus of people convergence, national economy and society development. However, natural disasters occur easily and frequently in these areas. Tianjin Binhai New Area (TBNA) lies in the center of the Bohai Rim Region. Following the Shenzhen Special Economic Zone and Pudong New Area, TBNA becomes a new polarization of economic development which drives regional growth. Affected by physical-geographical conditions and human activities, however, TBNA is one of the areas where the loss from natural disasters is huge and fatal in the coastal areas in China. In view of the main causing factor, the numerical model of land subsidence was established. With three groundwater extraction scenarios, the computer program was compiled to predict the land subsidence in the process of dynamic changes of groundwater level. Based on the complex dynamic multi-hazard risk assessment theory, in accordance with population planning, land use planning and socio-economic development plan of TBNA, and according to prediction of land subsidence and sea level rise, three scenarios were designed, that was the most unfavorable, moderate, and the most ideal scenarios. Pearson-Ⅲ distribution method was used to calculate intensity of the different frequency’s maximum rainstorms in 24 hours by rainstorm data of the past 40 years at 14 hydrological stations in TBNA and its nearby regions. Inverse distance weight and Disjunctive Kriging method were respectively employed to interpolate the different frequency’s maximum rainstorms in 24 hours. The calculation model of flood submerged area was therefore established by GIS. The submerged area and depth were calculated by the module of “non-source flood”. On the basis of the loss rate of different submerged depth, the submerged loss was gained. The results showed that, by 2020, under Scenario 1, the submerged area is 32.73%, 29.34% and 26.01%; inundated population accounts for 338×104, 305×104 and 264×104; and the loss of submerged is 220.89×108yuan, 181.39×108yuan and 139.12×108yuan respectively induced by torrential rain with return period of 1 000, 200, and 50 years. Under Scenario 2, the submerged area is 30.70%, 27.47% and 24.23%; inundated population accounts for 318×104, 289×104 and 248×104; and the loss of submerged is 199.68×108yuan, 150.31×108yuan and 126.03×108yuan respectively induced by torrential rain with return period of 1000, 200, and 50 years. Under Scenario 3, the submerged area is 29.06%, 25.83% and 22.58%; inundated population accounts for 300×104, 268×104 and 224×104; and the loss of submerged is 174.48×108yuan, 135.29×108yuan and 111.53×108yuan respectively induced by torrential rain with return period of 1 000, 200, and 50 years.
HU Bei-bei , ZHOU Jun , WANG Jun , XU Shi-yuan , MENG Wei-qing . Risk Assessment on Rainstorm Waterlogging of Tianjin Binhai New Area Based on Scenario Simulation[J]. SCIENTIA GEOGRAPHICA SINICA, 2012 , 32(7) : 846 -852 . DOI: 10.13249/j.cnki.sgs.2012.07.846
Fig. 1 Locations of the hydrological stations图1 水文观测站分布 |
Table 1 Social asset loss rate with the different submerge depth (%)表1 不同水深社会资产损失率(%) |
分类资产 | 水深(m) | |||
---|---|---|---|---|
0~0.5 | 0.5~1.5 | 1.5~3.5 | >3.5 | |
工商业固定资产 | 5 | 5 | 7.5 | 10 |
工商业流动资产 | 5 | 10 | 15 | 20 |
商业库存物资 | 1 | 3 | 7 | 10 |
建筑业资产 | 1 | 3 | 7 | 15 |
通讯系统 | 1 | 3 | 7 | 15 |
居民财产 | 2 | 10 | 30 | 50 |
居民住宅 | 2 | 10 | 20 | 45 |
交通供水等基础设施 | 0 | 5 | 10 | 25 |
个体企业 | 5 | 5 | 7.5 | 10 |
其他损失(含防灾救灾费用、公共事业等) | 以全区损失的10%计算 |
Fig. 2 Spatial distribution of submerged depth of torrential rain with the different return periods in 2020图2 2020年不同重现期年最大24 h暴雨淹没深度 (a、b、c情景一;d、e、f情景二;h、i、j情景三;a、d、h 1 000 a一遇淹没水深; b、e、i 200 a一遇淹没水深; c、f、j 50 a一遇淹没水深) |
The authors have declared that no competing interests exist.
[1] |
戴相龙. 用科学发展观统领天津滨海新区的开发开放[EB/OL].
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
天津市统计局.天津统计年鉴(2010)[Z].北京:中国统计出版社,2010.
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
[26] |
|
[27] |
|
[28] |
|
[29] |
|
/
〈 | 〉 |