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Application Research on Complex River Network Areas Flood Risk Management and Water Resources Combined Optimal Dispatch Based on GIS and HydraN

Author: ShiLin
Tutor: ZengGuangMing; ZhangShuoFu
School: Hunan University
Course: Environmental Science and Engineering
Keywords: Dongting Lake complex river network areas flood risk GIS networkanalysis emergency response HydraN optimal dispatch DamageCalculator ERDAS flood control decision making
CLC: TV87
Type: PhD thesis
Year: 2010
Downloads: 114
Quote: 0
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Abstract

The complex river networks area located at Chongliu in Changde were taken as object of study as a typical type in this articel. Due to the special characteristics of geographic climate and complicated morphology of river network, the complex river networks areas are threatened by flood and suffer loses much more than other types of areas, and research on risk of flood and optimal dispatch in such area exhibits quite important scientific value and practical signification., This dissertation first summarized achievements and progress of reseachers in this field, and then analyzed the bottleneck problems of available methods and model, and as which a basis of research, introduced several modles domestic and overseas onto multiangular analysis.The main works and novel results of this dissertation include the following elements.(1) Aiming at the characteristics of complex river networks areas, many indexes such as soil structure and types、river network stucture and properties were used to make flood risk analysis and zonation in GIS, because the ordinary indexes like rainfall and terrain can’t describe flood risk well in Chongliu Area. The results of study shows that the indexes of river networks propertie and underlying surface have more important effects on complex river networks areas rather than other areas, and although the rainfall and terrain indexes play a key role in flood, they can’t help getting ideal results.(2)Aiming at the complexity and uncertainty of river networks, and considering the geographic characteristics and spatail topology of complex river networks areas, this research used network analysis based on GIS, by which the study simulated river tracing and emergent event response on the basis of nework modeling. The simulated results show that the network analysis based on GIS is a more flexible and accurate way to solve sudden emergency than traditional ways, and it can meet the demand of rapid decision. The results also proposed that the intergration of water quality model and network analysis based on GIS will benefit more to decision makers and play a more important role in this field.(3)According to the lack of varieity and efficiency of traditional methods, by which can’t economy utilize energe and water resources well at the same time of flood defend, this research use HydraN program to simulated the rainfall-runoff situation based on steady model and unsteady model in Chongliu Area, an then proposed optimal dispatch schemes. HydraN program had been applied well in Chongliu complex river networks area, because of the precise simulation of pumps、sluices、culverts and reserviors. By the comprison of simulation results and statistical data, it is obvious that HydraN program after adjustment can display stages of rivers in network exactly, besides, the function of water constructionsl works simulations can demonstrate flood progress dynamically under different dispatch schemes. The application of this dispatch model has the advantages of nicety、aility、efficiency, and the compatibility of HydraN program can help dispatch to be more complete and effective.(4)Aiming at the situation of study area——high flood frequency、long time last、huge disaster damage, this research based on disaster damage reducing, assisted by some models and technologies, simulated flood disaster damage in time and space under extraordinary flood conditions. This research used the Virtual GIS module of ERDAS IMAGINE to simulate time-depth curves distribution in space; and used Damage Calculator combined1:50000DEM to draw depth-damage curve in time, then get the time-depth-damage spatial distribution of Chongliu Area by integrated the upper two. This research simulated flood submerged in1998, when there was a extraordinary flood in Chongliu Area, based on time-depth-damage curves. Compared with the damage of optimal dispatch and the1998’s, it is obvious that the optimal dispatch based on time-space damage curve can postpone the disaster time、shorten the whole disaster time and lessen disaster damage.According to the special characteristics of geographic、clamite、history and social economy, this dissertationusing used systemic analysis method, and assited by some advanced models and methods to evaluate the flood risk、design emergency response system、 propose optimal dispatch sche ules. The results of this research shows that, the flood risk of Chongliu Area is high as a whole, the damage emergency response is slow, the macro flood coordination is simple and absence of variety, the usage of lakes and embankments is not efficient and the energy and water resources is not utilized well in Chongliu Area, and there is a huge space to promote the level of flood management. The methods and results of this dissertation will have some scientific value and practice significant in complex river network areas flood assement and optimal combined dispatch.

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