Generation of simulated rainfall data at different time-scales
نویسندگان
چکیده
We desire to generate monthly rainfall totals for a particular location in such a way that the statistics for the simulated data match the statistics for the observed data. We are especially interested in the accumulated rainfall totals over several months. We propose two different ways to construct a joint rainfall probability distribution that matches the observed grade correlation coefficients and preserves the known marginal distributions. Both methods use multi-dimensional checkerboard copulas. In the first case we construct a copula of maximum entropy and in the second case we use a copula derived from a multi-variate normal distribution. Finally we simulate monthly rainfall totals at a particular location and compare the results.
منابع مشابه
Soil loss and runoff generation in rangeland, rain-fed and abandoned rain-fed agriculture land-uses under simulated rainfall
Soil erosion is a global challenge, seriously threatening soil and water resources andenvironmental qualities. One of the important factors to consider in the process of runoffgeneration and soil erosion is the physical and chemical properties of soils under differentland-uses. The aim of this study is to estimate soil erosion and runoff in rangeland, rain-fedand abandoned rain-fed agriculture ...
متن کاملSimulation of rainfall time series from different climatic regions using the direct sampling technique
The direct sampling technique, belonging to the family of multiple-point statistics, is proposed as a nonparametric alternative to the classical autoregressive and Markovchain-based models for daily rainfall time-series simulation. The algorithm makes use of the patterns contained inside the training image (the past rainfall record) to reproduce the complexity of the signal without inferring it...
متن کاملScale‐wise evolution of rainfall probability density functions fingerprints the rainfall generation mechanism
[1] The cross‐scale probabilistic structure of rainfall intensity records collected over time scales ranging from hours to decades at sites dominated by both convective and frontal systems is investigated. Across these sites, intermittency build‐up from slow to fast time‐scales is analyzed in terms of heavy tailed and asymmetric signatures in the scale‐wise evolution of rainfall probability den...
متن کاملSimplification of Parameters in a Complex Catchment Model: a Daily Rainfal Data Generation Process
This paper describes the rainfall data generation processes, which were used to simplify the recharge model developed by Khazai and Spink. The principles of techniques used for single and two sites generation are discussed. The application of the techniques for extending the rainfall records at the existing stations and increasing arbitrarily the numbers of rain gauges within the catchment are ...
متن کاملComparison and Evaluation of Six Climatological Drought Indices and Zoning of the Most Appropriate Index Using Inverse Distance Weighting (A Case Study: Isfahan Province)
Introduction: Drought, as a natural disaster, has a major impact on agriculture and ecosystem of the affected region. Droughts occur mainly in areas like Iran being located in the world dry belt, with below normal levels of rainfall. There is a need to study and predict the drought situation because, according to statistics, Iran is among the most water-stressed countries, with serious probl...
متن کامل