秦家镇绿色水稻产地水质分布GIS模拟

利用2002年水质监测数据,基于ARCGIS8.3平台,运用Geostastical Analyst分析模块,模拟秦家镇绿色水稻产地灌溉用水水质的分布.结果表明,秦家镇西北部水质最为清洁,Nemerow综合污染指数＜0.35,由北向西南水质下降,秦家镇附近水质最差,综合污染指数为0.499,接近警戒级(0.5);全镇灌溉用水清洁,属一等安全级,各污染物的单项污染指数均＜1,综合污染指数均＜0.5,适宜发展AA级绿色食品水稻基地.

GIS simulation on water quality distribution in rice-production base in Qinjia Town area

The paper aims to introduce the authors' simulated investigation on the distribution patterns of water quality in 2002 in Qinjia Town area. The simulation process was based on the principle of Kringing interpolation method, with which full use of the monitor data of water quality collected in 2002 in the area. Under the support of GIS software ARCGIS 8.3 and the relative extension modules ( the Geostatistical Analyst Model in ArcGIS ), the authors applied the GIS database for simulating distribution patterns of whole water quality. The simulated results, which clearly reveal the distribution areas of water quality in the Town area, have thus been stored in the format of ArcGIS Grid with a grid precision of 20 m. The simulated distribution-mapped results have also demonstrated that the water quality of the northwest of the town is the cleanest, with their Nemerow indexes below 0.35. The water quality seems to decline from the north to the southwest, and that of the Qinjia Town nearby are the poorest, with the Nemerow indexes being 0.499, which is near the warning-class (0.5) and therefore is to be paid attention to. The water quality of the town on the whole is up to the first-class. The pollution-monitoring index of each pollutant is below 1, with the Nemerow index being below 0.5. Hence, it is fit for the development of AA class rice-production base.