Study Of Algae Bloom In The Three Gorges Reservoir Region Based On Complex Networks Model Theory

The algal bloom is a pollution phenomenon of algae explosive growth in the water field.The algal bloom can release some poisonous substance and the algae layer can prevent oxygen in the atmosphere getiing in the water,which cause the aquatic animal dead by the asphyxia and also produce pecular smell in the water and bring out a seriou result.The water bloom which cause a seriou environmental pollution arose the attention and research of many scholars.However,hydro-fluctuation belt is the non-linear complicate ecotypic environment of dynamics opening system of many fators coupling and multi-dimensionality cooperation and integeration.,which is difficult to describe to research and quantitatively uncover the regularity of evolvement by the laterr-day's induction of methods and theorys.This article use Complex Networks theory,which decribe and resolve the complex system of integration behavior on Graph theory and statistics regularity.Since 1998 Watts dicovered the Small World attribute of CNs theory and 1999 Albert discovered the Scale-Free attribute of CNs theory,the application field of CNs theory is extended,which provides the new views and ideas and methods to reseach and describe the algae pollution in the hydro-fluctuation belt.There are primary two parameters to describe the CNs, which are the average path length and clustering coefficienct.Based on the definition of CNs theory, the average path length is the distance of two random dots, and the clustering coefficent is the numerical value description of one dot connetion possibility to be related to other dots.This article is based on CNs theory,the real networks can be describe as a graph which is make up of the dot-collection and the verge-collection.The hydro-fluctuation belt can be describe as the system of CNs ,which can be caculated by the reasonable description of hydro-fluctuation belt with the CNs system and deduce by the contrary to describe the behavior of algae bloom.Base on the CNs theory and statistics regularity,this article describes the fators of algae bloom as the dot-collection,and describes the effection of fators of algae bloom as the verge-collection.Therefore,the algae bloom which is result on the multi-fator's coupling and multi-dimensionality cooperation in the hydro-fluctuation can be describe as CNs in which the dots connet with each other.On primary foundation of the CNs model of algae bloom ,based on the definiton of CNs theory of average path length and clutering coefficient ,this articlconcludes that in the CNs model system of water bloom the average path length and the possibility of water bloom is in the inverse ratio, and clustering coefficient reflects the extent of effection of each factor which cause the water bloom. Use the actual inspect data in the Jialingjiang river and the Yangtze River in the pring 2007 and the Wujiangdu reservior in august 2002 to calculate the average path length and the clustering coefficient of the CNs model of the algal bloom and find that the L in the area of water bloom is smaller.It explains that the L is the more smaller the possibility of the algal bloom is more easier,which validate the concluding result of the CNs model of water bloom.Meanwhile,the coefficient of algae bloom in water area is smaller than that of non-water bloom in the area.It demonstrates that at the period of algae bloom the coefficient of water bloom increase at first and decrease then and increase finally.Therefore,at the period of algae bloom(previous time of algae bloom, time of algae bloom,fadeaway time of algae bloom),the mutual effection of algae bloom factor strengthen at first and is weakened then and strengthen finally.