A Stochastic Simulation Method for Daily Runoff and Sediment Rate Sequences Based on Multiscale Quantile Mapping and EC
A stochastic simulation and quantile technology, applied in the field of stochastic simulation, can solve the problems of difficult stochastic simulation calculation, high dimension, and many calculation parameters, and achieve the effect of avoiding heavy calculation workload and simple calculation.
Active Publication Date: 2022-08-09
ZHEJIANG UNIV
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Problems solved by technology
When it is necessary to simulate the runoff and sediment transport of many stations, due to the high dimensionality, there are too many parameters to be calculated, it is difficult to use the above method for random simulation calculation
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[0048] The embodiments are described in detail below with reference to the accompanying drawings.
[0049] The present invention proposes a stochastic simulation method for daily runoff and sediment transport based on multi-scale quantile mapping and EC function. statistical properties. like figure 1 Shown is the simulation calculation flow of the present invention, including the following steps:
[0050] Step 1. According to the daily-scale distribution characteristics of runoff and sediment, use the Gamma distribution function to fit the runoff and sediment, and use the maximum likelihood method to estimate the distribution parameters;
[0051] Step 2. Bring random numbers subject to uniform distribution between (0, 1) into the inverse function of the fitted distribution to obtain a random simulation sequence of runoff and sediment transport that does not consider various correlations;
[0052] Step 3. Use the multi-scale quantile mapping method to process the sediment tr...
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The invention discloses a random simulation method of daily runoff and sediment transport rate sequence based on multi-scale quantile mapping and EC. The steps of the method are as follows: first, the Gamma distribution is used to randomly simulate the daily flow and sediment transport sequences of each station, and then the multi-scale quantile mapping method is used to reorder the sediment transport sequences of the most upstream stations, and then keep the sequence order unchanged. In the case of changes, other sequences were reordered according to the Empirical Copula of the observed sequences. The simulation method can simultaneously ensure the distribution characteristics of the sequence at different scales and the correlation between space and variables. It provides a new method for stochastic simulation of runoff and sediment transport sequences, and also provides technical support for the study of water and sediment problems in the lower reaches of the Yellow River.
Description
technical field [0001] The invention belongs to the field of stochastic simulation in the field of hydrology and water resources, in particular to a stochastic simulation method for the sequence of daily runoff and sediment transport rate based on multi-scale quantile mapping and EC. Background technique [0002] The runoff will affect the downstream water intake and ecological environment, and the sediment transport rate will affect the sedimentation of the reservoir and the river channel, and the water quality of the river channel. Both are important hydrological variables that affect the design and operation of water conservancy facilities. Stochastic simulation research on runoff and sediment transport rate plays an important role in the design and construction of water conservancy facilities, the regulation of water and sediment in the basin, and the water environment and water ecological governance. However, there is a significant correlation between runoff and sedimen...
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IPC IPC(8): G06F30/20G06F17/18G06F17/16G06F17/15G06F111/08G06F111/10G06F119/12
CPCG06F30/20G06F17/15G06F17/16G06F17/18G06F2111/10G06F2111/08G06F2119/12Y02A20/152
Inventor 王奕童谢京凯王远见许月萍
Owner ZHEJIANG UNIV