The effect of urban flood control on evolution of the urban morphology: Case study of Changde, Hunan

2011 ◽  
Author(s):  
Sirun Hu ◽  
He Bing
Keyword(s):  
Flood Control ◽  
Urban Morphology ◽  
Urban Flood

Rainwater storage tank as a remedy for a local urban flood control

2008 ◽  
Vol 8 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Youngjin Kim ◽  
Mooyoung Han
Keyword(s):  
Flood Control ◽  
Peak Flow ◽  
Flow Curves ◽  
Urban Flood ◽  
Runoff Analysis ◽  
Tank Capacity ◽  
Versus Peak ◽  
Flood Condition ◽  
Rainwater Tanks

Surcharge runoff over the capacity of drainage pipes is one of main flood breaking factors in urban area. Change into larger pipes is costly and time consuming solution. Rainwater tanks can be a sustainable solution for the control of heavy runoff. The Rainfall-Storage-Drain(RSD) model is developed for the design of rainwater tanks of flood control. Design rainfall of Huff's distribution and runoff analysis on building rooftop makes inflow curves into the tanks. Through a water balance equation, tank volume versus peak flow curves can determine the minimum tank volume needed for controlled peak flow value of a design period. The case study in Seoul City shows a tank of 29 L/m2 can control the runoff of 30-years with the drainage pipes of 10-years design period. The RSD model can give simple and easy curves to understand for tank capacity determination in a local flood condition.

Fuzzy Variable Assessment of Urban Flood Control System Safety in Jinan

2010 ◽  
Vol 159 ◽  
pp. 279-284
Author(s):  
Xing Ju Wang ◽  
Yu Wei Hao ◽  
Yue Lu
Keyword(s):  
Control System ◽  
Flood Control ◽  
Fuzzy Variable ◽  
Assessment Model ◽  
System Safety ◽  
Urban Flood ◽  
The Sustainable Development ◽  
The Stability ◽  
Variable Fuzzy Sets

Urban flood control system is a collection of various preventive measures taken to resist and mitigate flood. Assessment of urban flood control system safety is one of the important measures to coordinate the urban social planning and the urban flood control facilities.The assessment can also promote the sustainable development of city.In allusion to urban flood control system safety is a fuzzy concept with vague denotation, a fuzzy variable assessment model of urban flood control system safety is constructed in this paper based on theories of variable fuzzy sets and relative different functions.The method can determine relative membership degrees and functions of various indexes associated with the urban flood control system safety scientifically and reasonably; through changing the model,the stability of grade eigenvalues is tested; the mean of grade eigenvalues is calculated to improve the reliability of assessment results. The synthetical assessment of flood control system safety can be implemented with the method adopted in this paper.By 4 safety grades, 9 key indexes were screened in the urban flood control system of Jinan to implement the safety assessment in this paper. The case study of Jinan shows that the proposed method is of practical use.

scholarly journals A Method for Dynamical Sub-Watershed Delimitating by No-Fill Digital Elevation Model and Defined Precipitation: A Case Study of Wuhan, China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 486
Author(s):  
Hongping Zhang ◽  
Xinwen Cheng ◽  
Lei Jin ◽  
Dong Zhao ◽  
Tianjing Feng ◽  
...  
Keyword(s):  
Water Level ◽  
Digital Elevation Model ◽  
Flood Control ◽  
Return Periods ◽  
Wuhan City ◽  
Urban Flood ◽  
Digital Elevation ◽  
Elevation Model ◽  
Control Management

Watershed delimitation is very important in flood control management. The traditional sub-watersheds delimitated by a filling digital elevation model (DEM) may change the real sink area, such that it may not be the best choice in studies sensitive to sub-watershed storage. This paper proposes a dynamical watershed delimitation method using a no-fill DEM and precipitation. It considers a closed sink area containing cells that fully flow into a large special cell, which can flow out when its water level is “higher than outlet”. We took Wuhan City as a study area and defined the precipitation in return periods of 1, 5, 20, or 100 years to derive the sub-watersheds. It is found that, in the four delimitations, the ratio of isolated basic units which could not flow outside were 27%, 9%, 5%, and 1%, respectively, as the precipitation increased. The results show that the provided method satisfies the assumption that the sink area might overflow with increased precipitation. The sub-watershed delimitated by the proposed method has higher correlation with the distribution of waterlogging points than those delimitated according to the D8 algorithm. These findings indicate that the proposed method can derive reasonable sub-watershed delimitation and that it may be helpful in the practice of urban flood control management.

scholarly journals Evaluation of Urban Flood Control Project –Case Study at Bendung Watershed in Palembang City, Indonesia–

2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Rian Dinata
Keyword(s):  
Flood Control ◽  
River Flow ◽  
Small Rivers ◽  
Urban Flood ◽  
Main River ◽  
Flood Damages ◽  
Cost And Benefit Analysis ◽  
The Cost ◽  
The City

Abstract:  Palembang City locates on a lowland where the altitude is between 12 and 30m above sea level. There are many small rivers that flow into a main river, Musi river. Due to the topographical configuration and a seasonal heavy rainfall, those rivers had been overflowed and the city had an inundation disaster. Bendung watershed is one of the nineteen watersheds in Palembang City, and the watershed also experiences the inundation disaster frequently due to the flood caused by a poor river maintenance and drainage system.The local government of Palembang City has applied some flood control projects such as a normalization project to reduce the flood damages. These measures checked the river flow over the dike, but some areas still suffered from the flood damages due to their topography. Based on the current situation, this study evaluates the efficiency of the existing normalization project in this watershed to find a solution that reduces the flood in those areas. Furthermore, this study investigates the feasibility of infiltration-well system to overcome the flood in those areas. The feasibility study includes the cost and benefit analysis to realize the infiltration-well system for easing the inundation problem.Abstrak: Kota Palembang terletak di dataran rendah dengan ketinggian antara 12 sampai 30m di atas permukaan laut. Karena konfigurasi topografi dan curah hujan musiman yang tinggi, sebagian Kota Palembang sangat rentan terhadap genangan dan bencana banjir . DAS Bendung merupakan salah satu dari sembilan belas DAS yang ada di Kota Palembang, dan DAS tersebut juga sering mengalami bencana genangan akibat banjir yang disebabkan oleh sistem drainase yang buruk.Pemerintah Daerah Kota Palembang telah menerapkan beberapa proyek pengendalian banjir seperti proyek normalisasi sungai. Proyek ini cukup sukses mencegah air sungai bendung meluap melewati tanggul sungai tersebut, tetapi beberapa lokasi yang jauh dari sungai bendung masih mengalami genangan karena topografinya. Berdasarkan kondisi ini, studi ini mengevaluasi efisiensi proyek normalisasi di DAS ini untuk mencari solusi yang dapat mengurangi banjir di wilayah tersebut. Selanjutnya studi ini mengkaji kelayakan sistem sumur resapan untuk mengatasi banjir di wilayah tersebut. Studi kelayakan lain meliputi analisis biaya dan manfaat sistem sumur resapan untuk mengatasi masalah genangan. 

scholarly journals The application of environmental governance for sustainable watershed-based management

2021 ◽  
Author(s):  
Seiichi Kagaya ◽  
Tetsuya Wada
Keyword(s):  
Environmental Protection ◽  
River Basin ◽  
Watershed Management ◽  
Water Use ◽  
Flood Control ◽  
Environmental Governance ◽  
Planning Process ◽  
Environment Assessment ◽  
Control Water

AbstractIn recent years, it has become popular for some of countries and regions to adapt the system of governance to varied and complex issues concerned with regional development and the environment. Watershed management is possibly the best example of this. It involves flood control, water use management and river environment simultaneously. Therefore, comprehensive watershed-based management should be aimed at balancing those aims. The objectives of this study are to introduce the notion of environmental governance into the planning process, to establish a method for assessing the alternatives and to develop a procedure for determining the most appropriate plan for environmental governance. The planning process here is based on strategic environment assessment (SEA). To verify the hypothetical approach, the middle river basin in the Tokachi River, Japan was selected as a case study. In practice, after workshop discussions, it was found to have the appropriate degree of consensus based on the balance of flood control and environmental protection in the watershed.

Urban flood hazard analysis in present and future climate after statistical downscaling: a case study in Ha Tinh city, Vietnam

2021 ◽  
Vol 18 (4) ◽  
pp. 257-274
Author(s):  
T. T. A. Le ◽  
N. T. Lan-Anh ◽  
V. Daskali ◽  
B. Verbist ◽  
K. C. Vu ◽  
...  
Keyword(s):  
Statistical Downscaling ◽  
Flood Hazard ◽  
Hazard Analysis ◽  
Future Climate ◽  
Urban Flood

From Community to Public Familiarity: Neighborhood, Sociability, and Belonging in the Neoliberal City

2021 ◽  
pp. 107808742110215
Author(s):  
Felipe Link ◽  
Andrés Señoret ◽  
Felipe Valenzuela
Keyword(s):  
Social Relations ◽  
Sense Of Belonging ◽  
Regression Models ◽  
Secondary Data ◽  
Critical Factor ◽  
Urban Morphology ◽  
Demographic Characteristics ◽  
Logistic Regression Models ◽  
Pedestrian Space

Current urban neoliberalism processes have shaped and changed contemporary cities, including the local scale’s built environment and social relations. This article aims to study how such transformations affect local sociability by analyzing the effects of neighborhoods’ morphology and socio-demographic characteristics on different forms of interactions and how they affect the sense of belonging. Taking the Metropolitan Area of Santiago, Chile, as a case study, we gathered secondary data on urban morphology and surveyed ten neighborhoods to measure sociability patterns. The results obtained from multilevel logistic regression models show that time living in the neighborhood and public pedestrian space is the most critical factor affecting neighborhood sociability. Moreover, instead of local ties, public familiarity is the form of sociability with the most substantial effects on a sense of belonging. We conclude that recent neighborhoods, formed by neoliberal urbanization, tend to discourage neighborhood sociability and a sense of belonging.

Research on the Green Urban Morphology Based on BIM - A Case Study on the Urban Design in Nanhe City

2013 ◽  
Vol 368-370 ◽  
pp. 78-82
Author(s):  
Ping Shu ◽  
Jun Xu ◽  
Li Jun Wang
Keyword(s):  
Urban Design ◽  
Design Process ◽  
Design Patterns ◽  
Urban Morphology ◽  
Theoretical Studies ◽  
Design Practice ◽  
Building Information Model ◽  
Building Information ◽  
Spatial Morphology

Based on theoretical studies of the urban spatial morphology, this paper introduces advanced concepts and methods of BIM (Building Information Model) into the urban design in Nanhe City ,and then respectively makes innovations of the urban design practice supported by BIM technology in the process of design, optimization and implementation of the program, attempting to explore BIM-based design patterns of the urban spatial morphology to make the traditional urban design process more rational and scientific, to expect to reach the green and sustainable urban spatial morphology.

Study on Urban Flood Control and Drainage in Beijing

2014 ◽  
Vol 1065-1069 ◽  
pp. 2381-2385
Author(s):  
Sen Guo Zhan ◽  
Bao Hui Men ◽  
Jia Jie Wu ◽  
Zheng Da Duan
Keyword(s):  
Heavy Rainfall ◽  
Flood Control ◽  
The Philippines ◽  
City Government ◽  
Urban Flood ◽  
The City ◽  
New Look

On 21 July 2012, a huge thunderstorm hit Beijing, prompting the city government to act immediately to deal with the emergency. Yet great losses were caused, exposing problems about urban flood control and drainage, and making people take a new look at them. It is not uncommon for a rainfall of such a degree to happen in Asia. Comparatively speaking, however, unlike in Beijing, fewer damages are caused in Taiwan, Japan and the Philippines given the same situation. In this article, therefore, the problems arising after a heavy rainfall and their solutions will be discussed.

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