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Urbanization is one of the most intensive processes of human activities which have changed the earth's surface, and is also one of the important factors influencing the hydrologic process. Base on the high resolution image and topographic map, this paper conducts a case study on the flood response to river system change under urbanization in a typical plain river network region of Fenghuajiang River...
This paper took Yancheng region as the study area to explore the relationship between landscape pattern and water quality. Land use types were obtained from the classification of the TM images, 2006. Landscape patterns characterized by land use pattern and five selected landscape metrics were extracted from buffer zones, ranging from 200 to 1500m, and used in correlation analysis against various water...
In this study, 4 spatial interpolation methods, including Thiessen polygon, inverse distance weighted (IDW), ordinary kriging (OK), and ordinary cokriging (OCK), were adopted for spatial monthly precipitation interpolation. As confirmed by the results, OCK which adopt elevation as secondary variable was superior to other methods. On the other hand, the performance of OCK was also compared with that...
A grid-based GIS approach to flood submergence simulation and risk analysis was proposed using an integration of GIS, telemetering stage and high resolution remote sensing image (ALOS), in southeast plain of Yinzhou district. The digital elevation model (DEM) was created based on 1:10000 topographic maps and 1:5000 thematic maps, and several pre-processing methods, including depression filling, urban...
The changes of impervious surface from 1986 to 2006 and the relationship between those changes and hydrological response were studied in the Qinhuai River Basin (2631 km2), which is located in the southwest of Jiangsu Province, P. R. China. A series of Landsat imagery during that period was employed to extract impervious area using the Linear Spectral Mixture Analysis. The results showed that impervious...
This paper presents the findings of an integrated study on geological disasters in Anji County. Based on field work and inventory data, the spatial and temporal distribution is discussed. The Digital Elevation Model, selected rainfall data are also used to analyze the correlation of geological disasters and their probable causes. Based on this, possible places of geological disasters are predicted...
Qinhuai River Basin is located in the lower reaches of Yangtze River. With acceleration of urbanization, the flood risk of basin has increased and threatened blood and treasure of people. Based on RS and GIS methods, the impact of urbanization on the flood risk was analyzed in space and time. The study showed that, 1) Urbanization aggravated the flood risk. The space distribution of urbanization and...
The reflectance of red and near infrared bands has proved to be sensitive to water depth. This paper takes four sections in Jiangsu Coastal Zone as a typical study area. Different models for retrieval of water depth have been evolved based on analysis of the ETM image and field measurements of the research area. Then, water depth was computed by depth retrieval model and the accuracy of predicted...
As the development of geographical information system (GIS), water resources information systems have been applied in water conservancy management increasingly. However, there are still some problems. Along with the improvement of hydrological telemetering systems, more and more data could be acquired. The inconsistencies in data, as well as bulk information processing would intensify the pressure...
Trend detection of hydrological variables is important in the understanding of flood risks in a river basin. Nonparametric technique was applied to the analysis of summer precipitation in Huaihe River Basin (HRB). Results shows that mean precipitation varies greatly with greater values occurring in July temporally, and that greater values occur in the southern and eastern HRB and smaller values in...
Spatial precipitation interpolation plays an important role in flood control and water resources management. However, the precipitation exhibits great spatial variability, and this makes spatial precipitation estimation difficult. This study discussed the applicability of Radial Basis Function Network (RBFN) for spatial precipitation interpolation. RBFN is usually employed for interpolation in multi-dimensional...
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