Remote Sensing Monitor Of Inner Mongolia Sand And Dust Storm In Recent Two Years

Sand and dust storm, mainly occurring in the deserts and its neighboringarid and semi-arid area, is a common natural disaster through a Sand and duststorm of blowing the eclipse and whetting the eclipse, quicksand press, thestrong wind assault, environment pollution etc., and has negative influence onecosystem environment, mankind health, the social economy produces,resulting in direct and indirect loss of the national economy which enlargeyear by year. Inner Mongolia is one of the Sand and dust sources and mainpath regions of our country, the occurrence of the Sand and dust storm has notonly affected the surroundings region the Jing Jin Tang, but also worse theenvironment depravation and poverty of the regions, causing the extensiveconcern of social public, putting forward the urgent demand of accuratemonitor and analysis and research.See from the monitor means of the Sand and dust storm, the remotesensing monitor Sand and dust storm methods of the former are all to makeuse of the reflectivity of the Sand and dust and the background object andradiate the bright degree or radiate the difference of bright directly. Thereflectivity of the object not only has something to do with its physics formand the sun shine condition, but also relevant to latitude and elevation height,seasons and probe into time. The radiation brightness degree and radiationbrightness tempe rature relevant to the property, surface status (such as roughdegree, color...etc.) of the ground-objects, and also relevant to temperature Tand the wave-lengthλand are subjected to the conditional influence of thesun radiation strength and the exterior environments. So the above-mentionedmethod is instability, under the condition of different environment, lesscomparability, the method is still not mature.In this paper, the Sand and dust storm of Inner Mongolia in recent two years is monitored by building up a Sand and dust storm index model ofstable fixed amount. At the same time, based on the analysis of relationbetween factor with it and Sand and dust storm, the reason countermeasuresof Sand and dust storm in Inner Mongolia in recent two years are studied.The main conclusion of the paper is as follows:(1) Setup of the sandstorm strength model: The emissivity (LSE) of theground-objects has something to do with the property, the surface status (suchas rough degree, color...etc.) of the ground-objects, and also is the function ofthe temperature and wave-length. The emissivity was affected by the groundobject composition, but with the sandstorm appearing, the sand in the airwould contributed to the emissivity, so it could be included that the emissityduring the occurring of the sandstorm was the result of the cowork of theground composition and the sand. The main composition of the sand dust inInner Mongolia was aluminum silicate and quarts. The Sand and dust stormmaterial composition of Inner Mongolia is close to color, but rough degree isdissimilarity because of the difference of the Sand and dust strength. With thesand dust strength strengthen, the sand dust layer thickens, and the roughdegree become lower, namely the even degree of the Sand and dust stormincrement, spread the hot radiation that the sensor receiver in the comparisonis decrease. So the emissivity(LSE) can be used to represent the Sand and duststorm strength of Inner Mongolia. In this paper based on the heat-radiatingtheory, make use of the emissivity (LSE) characteristics of the object, andcombine the characteristics of the hot radiation wave band of the data ofMODIS, to set up a more stable fixed amount to judge index number model ofthe Sand and dust strength. Through a verification of many Sand and duststorms, the method can accurately monitor the sand dust strength.(2) The remote sensing monitor of the Sand and dust storm: the Sand anddust index model was used to monitor the Sand and dust storm numbers, the occurrence scope, strength of Inner Mongolia that the MODIS data receives inrecent two years, getting a conclusions that compare to 2006, the 2005 ofsandstorm is less, small scope and less strength.(3) The reason analysis of the sandstorm: at first, through study on therelation between factor with it and Sand and dust storm, get the correlationsbetween sand dust strength and wind velocity of the same year, summerprecipitation of last year, autumn precipitation of last year, summer vegetationcover of last year are high; through the analysis of day number of Sand anddust storm and factor with it, can get that the correlations between daynumber of Sand and dust storm and spring temperature, spring precipitation,summer precipitation of last year, vegetation cover of last year, the number ofday of strong wind are high. On the basis, the reason of day number andstrength of Sand and dust storm in Inner Mongolia in recent two years isanalyzed.(4) The prevention countermeasures of the dust storm: from the anglesof the reason of sandstorm taking place and human can change, improve theprevention and countermeasures about controlling the population growth,renew vegetation, protect the ecosystem environment and raise the forecastand estimate abilities etc.