Qualitative analysis of future flood risk in the Taihu Basin, China

Harvey, Gemma L.; Thorne, Colin R.; Cheng, Xiaotao; Evans, E. P.; Simm, S. Han J.D.; Wang, Y.

doi:10.1111/j.1753-318x.2009.01024.x

Cited by 28 publications

(13 citation statements)

References 40 publications

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“…Since it has one of the highest gross domestic products (GDP) and the most urbanized basin area in China, many projects have been allocated for watershed-based research since the 2000s and earmarked until 2025. Due to serious historical water pollution and flooding in the plains area, precise watershed delineation is of great significance for water conservation in the region [23,24].…”

Section: Study Areamentioning

confidence: 99%

A Method of Watershed Delineation for Flat Terrain Using Sentinel-2A Imagery and DEM: A Case Study of the Taihu Basin

Yang

2019

IJGI

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Accurate watershed delineation is a precondition for runoff and water quality simulation. Traditional digital elevation model (DEM) may not generate realistic drainage networks due to large depressions and subtle elevation differences in local-scale plains. In this study, we propose a new method for solving the problem of watershed delineation, using the Taihu Basin as a case study. Rivers, lakes, and reservoirs were obtained from Sentinel-2A images with the Canny algorithm on Google Earth Engine (GEE), rather than from DEM, to compose the drainage network. Catchments were delineated by modifying the flow direction of rivers, lakes, reservoirs, and overland flow, instead of using DEM values. A watershed was divided into the following three types: Lake, reservoir, and overland catchment. A total of 2291 river segments, seven lakes, eight reservoirs, and 2306 subwatersheds were retained in this study. Compared with results from HydroSHEDS and Arc Hydro, the proposed method retains crisscross structures in the topology and prevented erroneous streamlines in large lakes. High-resolution Sentinel-2A images available on the GEE have relatively greater merits than DEMs for precisely representing drainage networks and catchments, especially in the plains area. Because of the higher accuracy, this method can be used as a new solution for watershed division in the plains area.

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Section: Study Areamentioning

confidence: 99%

A Method of Watershed Delineation for Flat Terrain Using Sentinel-2A Imagery and DEM: A Case Study of the Taihu Basin

Yang

2019

IJGI

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“…With the degree of urbanization of 80% in 2015 [30], the basin supports 4.8% of the nation's population (1.39 billion) and produces 11.6% of the gross domestic product (GDP), with 0.38% of the land area of China [31]. Also, flood disasters have been taking place frequently in the basin due to the long duration of rainfall in summer [32]. According to the most outstanding flood disasters of TLB in recent decades, the northern part of the basin (namely sub-basin HX and WCXY) has been suffering more rainfall compared with the rest of the sub-basins.…”

Section: Study Domainmentioning

confidence: 99%

Using Copulas to Evaluate Rationality of Rainfall Spatial Distribution in a Design Storm

Wang

et al. 2018

Water

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In the absence of long-series streamflow records in plain areas, design storm, which serves as the most important input in a hydrologic model, plays an important role in flood control and water resources management. For a large drainage basin, design storm may be estimated for sub-basins separately; thus the spatial distribution of design storm needs to be carefully treated. However, few studies have been carried out to evaluate the rationality of the spatial distribution in a design storm, which means the storm over space should be in accordance with actual needs or its distributing patterns. Taking the Tai Lake Basin (TLB), 3-d Copula-based models combining extreme rainfall of different sub-basins were built using long-term rainfall data, and conditional probabilities of sub-basins encountering certain amounts of rainfall were investigated to evaluate the rationality of the design storm. Results show that the spatial distribution of the design storm based on a typical year is hardly rational, in which rainfall of the northeastern part of the basin is suggested to be weakened while in the southwest to be strengthened; after the rainfall is redistributed based on long-term information, it shows a better rationality of spatial distribution. Such information provides valuable significance in guiding flood control of TLB, and the considered evaluating method can be used for similar basins in plain areas.

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“…FORESIGHT STUDY APPROACH: The approach described in this Technical Note is based largely on that used in the Foresight Future Flood and Coastal Defence project, commissioned by the UK Office of Science and Technology (Evans et al 2004, Thorne et al 2007. The approach has also been used to study flood risk in the Taihu River Basin, China (Harvey et al 2009). All Foresight studies make use of futures research methods, a large and diverse group of methods that include techniques such as scenario planning and expert elicitation.…”

Section: What Kinds Of Questions Can a Forsight Study Address?mentioning

confidence: 99%