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Finite volume method was used in this paper to simulate the flow. Model grids were generated automatically. Data was collected from GIS, module terrain was interpolated, and the river channel unit was generalized. The calculation and the treatment of river-type flow, ground type flow, and abrupt slope-type flow were given. Rainfalls in different return periods was calculated, a mountainous rainstorm...
This paper study the basic principle of the flood calamity assessment based on GIS. based GIS theory, using the the overlayer algorithm of hierarchical maps in GIS method, through the corresponding constraint condition, Fuzzy Similarity Nearness degree matter-element model is applied to the flood disaster moves the plan to carry on the synthesis judgment the method.
This paper has integrated the automatic monitoring system of water resources, and fully excavated the monitoring information contents, and introduced information fusion technology, and discussed and analyzed information collection and transmission and processing, and brought forward the system which has versatility and portability and scalability by using geographic information systems and databases...
Currently the geographic information system (GIS) is mainly applied to describe and analyse static information of space, lacking of analysis of space-time and ability of dynamic simulation.. The changes of landslides can be recognized the spatio-temporal process, bringing new challenge and need to GIS analysis of space. Cellular automata Cellular automata (CA), is a “bottom-up” dynamic simulation...
Studies of paleoclimate variations in local regions are seriously restricted by the low resolution and uncertainties of the simulated data at present. In order to apply large-scale modeling data to paleoclimate research in local regions, an effective downscaling model based on three-layer back propagation neural network (BPNN) is developed. Observational and ECHO-G simulated data are employed to train...
As the second largest geological disaster after the earthquake, landslide is harmful to ecological environment and construction. To grasp the features of landslide evolution and to avoid and mitigate disaster is the main purpose of monitoring and prediction study. From the view of the prediction object, space, time, intensity (intensity of landslide activity and damage) of the landslide should be...
Spatial decision support system (SDSS) is based on geographic information system (GIS), and has the core model base. SDSS is a decisive system of facing objects space information and users which not only have analysis reserve and estimation for information, but also have information forecast and decision. This article has discussed complex product by using SDSS, and has designed the elementary model...
Fuzzy logic applied to mineral potential prediction,providing a powerful and flexible theoretical framework for dealing with multi-layer modeling.This research is identified the similarity between the distribution mode of the known ores and the forecasting mode of comprehensive variables.The choice of fuzzy operator γ should be paid special attention to, the small change of the result would have a...
Multiple-session SoD problem is addressed in the static constraint RBAC model. An improved formal static constraint RBAC model is proposed and it will check the change of the UA relation to decide whether the union of the user's role set will satisfy the MER constraint during an administrative session. If it will not satisfy the constraint, some necessary withdrawing will be performed. The improved...
the correlative theory and platform of GIS regarding the ArcGIS software is used, and the sand liquefaction classify prediction of research regional area is analyzed. The sand liquefaction problem is a complex systemic work, is still a important research direction for Geotechnical Engineering. In engineering reconnaissance, it is unscientific to evaluate the sand liquefaction under the limited investigation...
Media Independent Handover (MIH) is an emerging standard for handover across heterogeneous networks. It proposes to communicate network critical events to upper layer mobility protocols. Within MIH a Link_Going_Down (LGD) event is intended to provide predictive indications of network failure. We illustrate a scenario in which the indications provided by the LGD event are not sufficiently proactive...
In this paper, the current forecast of storm surge based on BP is adapted to deal with the characteristics of storm surge. One main kind of fuzzy information in geology calamity predicting system is solved by information diffusion method. The whole process is as follows: Firstly, influential information is collected by single step predicting model and neural network predicting model separately to...
Abstract-According to the problem existed in the work of mine hydrogeology information management, based on the analysis of functional requirement and system structure of mine hydrogeology information management system, mine hydrogeology information management system was developed on the basis of MapObjects , with VB 6.0 as development language, and with Access 2000 as back-end database. The system...
To solve the problem of the flashover risk assessment of contaminated insulator, a GIS-based region power grid polluted flashover precaution system is proposed in this paper. This system consists of two prediction models that the first is used to estimate contamination condition of insulator and the second is employed to forecast the probability of the flashover in complex weather conditions. The...
The prediction of water bursting in mines is complicated both in theories and technical practice, which takes many factors into consideration, such as hydrogeololgy, engineering geology, mining conditions, as well as rock mechanics and so on. Against this, the expert system of water bursting in mines combines expertise as well as theoretical achievement in water bursting in mines with artificial intelligence...
Real time weather forecasting is a highly influential tool in decision making for agriculture. Geographic Information Systems (GIS) can be built to provide information about topographic data such as elevation and distance to oceans or water reservoirs. This data has begun to have increased availability, providing easier access for developing new applications. By using geographic information together...
With regard to the increasingly prominent issue of cultivated land protection, it is necessary to establish a fast and effective early warning system that can have a real-time monitoring on cultivated land protection status. This thesis takes urban fringe area with prominent changes in cultivated land as the survey area, on the basis of comprehensively application database, System Dynamics (SD) and...
In order to decrease the damages caused by typhoon, an Artificial Neural Network (ANN) model has been established to predict the trend of storm flood in Shanghai, China. The model has capacity to simulate the brain's thinking process objectively and avoid the influence of the forecasters' subjective judgment. The present model is capable to predict the 12-hour ahead typhoon surge deviation in high...
Combining the character of landscape and the theory of Markov chain, this paper inferred the forecast model of fuzzy weight Markov chain. The new model which was called FWMC to predict the future value of cultivated land demand in land use planning. Factors to consider in driving conditions was used in this model, the real response to landscape pattern change position using a weighted Markov transfer...
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