Study Of Quantitative Modeling Of Intensity Of Human Activities In Jinghui Irrigation Area On The Basis Of RS/GIS

The influences of regional human activities on hydroecology and geographicenvironmental system have such characteristics as proactivity, interactivity, sustainability, andbidirectionality, etc. Current research on human activities and hydroecologicalenvironmental change has been weighted more heavily toward surface water resources (i.e.aquatic ecosystems) and water environmental surveillance, while it is still almost blank toconduct quantitative research on regional human activities with the3S Technology, especiallythe research on human activities and regional hydroecology and environmental system as aninseparable total system. At present, both domestically and overseas, there is no precedenton how to conduct quantitative analysis and build relevant model for the intensity of regionalhuman activities in multidimensional space with high-tech approaches such as remote sensing,etc and explore their linkage mechanism with hydroecology and geographic environmentalchange.This paper takes Jinghui irrigation area for example. On the basis of the principles suchas hydrology, zoology, geography, hydrogeology, remote sensing (RS), and geographicinformation system (GIS), it has studied the influences of human activities on thehydroecology and geographic environmental change of Jinghui irrigation area. Through theanalysis of the nature, space distribution characteristic and variation pattern of humanactivities closely related to the hydroecology and geographic environmental change of Jinghuiirrigation area, it has determined the intensity principal determinant index system for the threeareas of quantifiable human activities: society, economy, and culture, and explored themodel and method for the calculation of human activities intensity and analyzed theirinteraction with the hydroecology and geographic environmental change in the irrigation area.The main achievements and innovations of the paper are as the following:1. Specific to the long-term indeterminacy of the research scope of the researched area(no accurate location, especially the ambiguity on the northern border whose relevantinformation cannot be quantitatively collected and researched), this paper, with the GIS andGPS approach, has conducted an on-the-spot survey positioning on the northern border. Asfor other borders,500meters inward from the rivers (Jing river, Wei river, and Shichuan river) center line have been made buffer zones to determine its borders, and the final accuratelyconfirmed total area of the irrigation area is1287.029km2. It has established a foundationfor subsequent research and meanwhile has great practical significance.2. The land inside the researched area belongs to plain landform, with intense humanactivities trace. Due to other factors, the collection of the thematic information, i.e. theprincipal determinant related to human activities, such as the earth’s surface water body index,the vegetation coverage, the land utilization information and cities and towns information, etc,cannot be done with conventional methods. This paper has utilized modified new remotesensing method to collect these thematic information and achieved ideal effect. Thecollection of these remote sensing principal determinants is one of the key point of this paper.3. This paper has established a human activities intensity index system for such principaldeterminants as agricultural acreage, road density, cities and towns area ratio, the total lengthof diversion canal, vegetation index, surface water body index, population density, the totalnumber of exploited wells, per capita gross national product, the school enrollments forordinary high school, etc., and explored the remote sensing model and method for thecalculation of human activities intensity.4. This paper has established an intensity index calculation model for the humanactivities in the irrigation area based on remote sensing data. The calculation of the tertiarydata in the area with this model has shown that the value measured and calculated with theremote sensing model is basically identical to the actual data of the hydroecology andgeographic environmental change in this area during corresponding period, which indicatesthat this model is successful.Not only can the remote sensing quantitative research on human activities intensityenrich the theoretical research on interaction between human and hydroecology andenvironment, but also will it drive the theory and methodology research on hydroecology andenvironment, and broaden the remote sensing application and research field. Therefore ithas important scientific significance and application value.