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Ecological water supplement technology for lakes based on multi-scale wavelet transform

A wavelet transform, multi-scale technology, applied in water conservancy projects, river regulation, water conservancy engineering equipment and other directions, can solve the problems of insufficient water replenishment, inability to distinguish fluctuations, ignoring multi-scale and unstable characteristics of water level, etc.

Inactive Publication Date: 2010-09-08
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

In the traditional method of the minimum ecological water level of lakes, the multi-scale and unstable characteristics of the water level are ignored, and the cascade process of large and small different time scales implied in the sequence cannot be displayed, let alone the fluctuations at different scales. The proposal of the water replenishment plan deviates from the natural fluctuation characteristics of the water level and the hydrological conditions that the organisms have adapted to, and the water replenishment cannot achieve the desired effect

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  • Ecological water supplement technology for lakes based on multi-scale wavelet transform
  • Ecological water supplement technology for lakes based on multi-scale wavelet transform
  • Ecological water supplement technology for lakes based on multi-scale wavelet transform

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Embodiment Construction

[0015] like Figure 1~2 Shown, the concrete implementation method of the present invention is as follows:

[0016] 1. Use wavelet transform to analyze the time series of water level, a key hydrological factor describing the regional hydrological state, and obtain wavelet coefficients and main scale factors on different scales.

[0017] The original data is the annual water level data of Baiyangdian Lake from 1951 to 2005. The wavelet function chooses continuous wavelet transform for water level time scale analysis. Compared with the discrete wavelet function, the continuous wavelet function can perform scale expansion and translation, and obtain more time-scale localization information, which is suitable for scale analysis. Continuous wavelet analysis is to take any L 2 The square-integrable function x(t) in (R) space is expanded under the wavelet basis function ψ(t), that is, after the displacement of ψ(t) by τ, it is interpolated with the signal x(t) to be analyzed at dif...

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Abstract

The invention relates to ecological water supplement technology for lakes based on multi-scale wavelet transform, which is characterized by not only well extracting the information of the water level on different scales by applying the excellent performance of multi-resolution analysis of wavelet transform but also reconstructing the wavelet coefficients of main scales and combining other hydrological and ecological data to obtain the division standards of hydrological stages, determining the suitable hydrological stage containing the wet and dry seasons and putting forward a scheme of ecological water supplement for lakes, which simultaneously takes both the minimum ecological water level and the in-year water level fluctuation characteristic into account. Compared with the prior art, the invention is characterized by more deeply discussing the multi-scale characteristic of hydrology, being closer to the natural hydrological conditions of lakes than the single minimum ecological water level of traditional water supplement and providing bases for analyzing the state of the hydrological environment of degraded wetlands, formulating water supplement schemes suitable for specific regions and improving efficiency of water supplement for lakes.

Description

technical field [0001] The present invention relates to a lake ecological replenishment technology based on wavelet multi-scale transformation. After the water level, the key hydrological factor determining the state of the lake, is converted by wavelet transformation, the large and small time scales are reconstructed to determine the suitable hydrological stage. Considering different scales of ecological water levels and fluctuating lake water replenishment techniques, it provides a basis for analyzing the state of the degraded wetland water environment, determining the appropriate hydrological stage standards, formulating water replenishment plans suitable for specific regions, and improving lake water replenishment efficiency. Background technique [0002] The purpose of ecological water replenishment is to restore the original ecological level or maintain the amount of water required for a certain system balance. The formulation of the plan needs to consider the state of ...

Claims

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Application Information

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IPC IPC(8): E02B1/00E02B3/02
Inventor 崔保山李夏蓝艳杨其纯
Owner BEIJING NORMAL UNIVERSITY
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