Narrow Results

Accurate river channel and flood plain representation plays vital part in flood risk analysis. Terrain models such as TINs and DEMs are normally used to represent floodplains. But unfortunately finding a terrain model with a high density of stream channel elevation points that are sufficient for hydraulic modeling is not a easy task. However for years engineers and researchers have developed a high-resolution cross-section data for hydraulic modeling from field surveys, photogrametries and topographic maps. This research presented here introduces the procedures for creating integrated multiresolution TIN (ITIN) models for highresolution flood plain representation for flood risk analysis. The high-resolution river channel geometric data stored in HEC-6 hydraulic model and low-resolution flood plain data in the form of DEM created in Arc View GIS 3.2a were integrated by resolving the coordinate incompatibility in the both system. An integration procedure (ArcView extention) namely AVHEC6.avx has been developed between HEC-6 Hydraulic Model and ArcView GIS 3.2a to visualize model outputs in a more presentable manner through 3D capabilities of GIS.

GIS is widely used in grid for its excellent performance. In the practical operation, besides the accidents caused by discharge faults, there are also a lot of accidents which are induced by mechanical faults. The electrical detection methods are mainly about discharge faults, there's lack of methods about mechanical faults. The field measurement of 110 kV GIS, especially the part of bus, is carried out using the GIS vibration test system in this paper. The results show that the vibration of bus near the part with contact faults is strongest, while the bus vibration is generally weak. The results provide data support for the on-site testing of GIS vibration and fault diagnosis of mechanical faults.