Technique for calculating lake level of historical period

A lake and water level technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as inapplicability to semi-closed and open watersheds

Inactive Publication Date: 2010-12-08
BEIJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

In China, some scholars use the principle of water balance in closed watersheds to calculate the paleo-rainfall of lakes by combining various rainfall parameters and information of palyno-pollen assemblage belts. However, this method has certain limitations and is not suitable for calculating rainfall in semi-closed and open watersheds ( Shao Zhaogang et al., 2004; Wu Jinglu et al., 1993)

Method used

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  • Technique for calculating lake level of historical period
  • Technique for calculating lake level of historical period
  • Technique for calculating lake level of historical period

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] Apply the lake water level calculation method in this paper to a lake in northern China, using 210 Pb and 137 The age range of the sediments determined by Cs is 1830-2006.

[0058] ①Application of principal component analysis method for correlation analysis of sediment pH, TOC, TON, salinity, electrical conductivity, soil moisture, combustion value, clay and sand composition, the process is realized with the help of SPSS16.0.

[0059] Table 1 KMO and Bartlett test

[0060]

[0061] According to the standard given by the statistician Kaiser, the KMO value is greater than 0.6, which is suitable for factor analysis. In this case, the KMO is 0.63, which meets the standard. The associated probability given by the Bartlett sphericity test is 0.000, which is less than the significance level of 0.05, which is considered suitable. in factor analysis.

[0062] After rotating the factor loading matrix according to the variance maximum method, the first factor is mainly expla...

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Abstract

The invention discloses a technique for establishing a relationship among sporopollen, environmental index and lake level by using main component analysis, grey association and regressive mathematical methods based on sporopollen assemblage zones in lake sediments and typical physical and chemical indexes aiming at the problems of shortage and discontinuity of historical hydrological data of a lake. The technique can calculate the lake level of the historical period so as to learn species condition and hydrological condition of a lake ecosystem under low artificial interference and play an important role in maintaining the health of the modern lake ecosystem.

Description

technical field [0001] The invention belongs to the field of water ecosystem monitoring, and relates to a technique for calculating lake water levels in historical periods by using a mathematical modeling method on the basis of sporopollen assemblage zones and typical physical and chemical indicators in lake sediments. Background technique [0002] Pollen has the characteristics of light weight, large amount, and extremely long-distance dispersion. As biological fossils, they are preserved in various sedimentary layers, and have high reference value for restoring the state of the paleoenvironment, and have been widely used especially in the study of paleoclimate. In the historical period, the lakes were less disturbed by human factors, and the water level and volume of the lakes and the growth of plants were basically in a state of dynamic balance. At the same time, biological indicators were more sensitive to changes in the water level and volume, such as biomass, abundance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 杨志峰郭通陈贺
Owner BEIJING NORMAL UNIVERSITY
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