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The Study of Marine Ecosystems Dynamics and Health-evaluating System

Author: GuoJiaLiang
Tutor: WangHongLi
School: Tianjin University
Course: Engineering Mechanics
Keywords: Marine ecosystems Nonlinear Branch Health Assessment
CLC: Q178.1
Type: Master's thesis
Year: 2007
Downloads: 355
Quote: 7
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Abstract


Marine ecosystems , human survival and development is an important environmental , social and economic development is an important material foundation . Due to many factors , the marine ecosystem has been seriously damaged , such as marine environmental degradation , over-exploitation of marine biological resources , such as red tide disasters have occurred . In this paper, the modern theory of nonlinear dynamics of marine ecosystems dynamics were studied , and the use of object-oriented programming techniques to establish a marine ecological and economic health evaluation information system. Specific results are as follows : 1 , the establishment of a new algae - zooplankton ecology nonlinear dynamics model, which takes into account algae and zooplankton in the relationship between the growth . Study the stability of the model and HOPF bifurcation . Through the analysis of the selected bifurcation parameter reveals the nonlinear dynamic characteristics of the system . 2 , ecological and economic sustainable development of marine research object degree on factors affecting the health of marine ecosystems to analyze and filter out the per capita GDP, aquaculture production value , dissolved oxygen, inorganic phosphorus, inorganic nitrogen, chemical oxygen demand and other 23 participating factor ; according to the observed data samples analyzed each participating marine ecosystem health factors and the relationship between the level to determine the level of each factor and their weights , the establishment of marine ecosystem health evaluation index system. 3 , in order to build the marine ecosystem health assessment index system as the core, in the marine ecosystem health evaluation information system to conduct a detailed analysis based on the data processing system , the overall structure of the database and main functions , etc., for a more complete design. Object-oriented programming ideas, based on Microsoft 's Dot NET Framework and SQL Server2000 database , for the first time developed a marine ecological and economic health evaluation information system. The system was evaluated using the Tianjin Binhai New Area of marine eco-economic system 's health.

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CLC: > Biological Sciences > General Biology > Hydrobiology > Aquatic organisms, ecology and geography > Aquatic bio-ecological
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