论文部分内容阅读
利用遥感影像图进行武昌沙湖流域的土地利用分类,利用元胞自动机(CA)模型预测2011-2015年的土地利用变化,将CA预测结果与面源模型相结合,预测2015年沙湖流域面源污染物总氮(TN)、总磷(TP)、生化需氧量(BOD)负荷的时空分布.研究结果表明2003-2010年间,建设用地面积不断扩展,其他地类向建设用地转变速度依次为:农田56.8%、绿地35.1%、水域23.9%、未利用地8.9%.2011-2015年间各用地类型均有继续向建设用地转变的趋势.从污染物负荷总量的变化情况上看,2015年3种污染物的负荷总量较2003年均有较大幅度增长,其中:TN增长30.11%,TP增长17.32%,BOD增长43.38%.从污染物负荷总量的空间分布差异上看:TN由2003年的建设用地>绿地>农田>未利用地,转变为2015年的建设用地>未利用地>农田>绿地;2015年TP和BOD的污染负荷总量空间分布规律与2003年保持一致,为:建设用地>未利用地>农田>绿地.
Land use classification of Wuchang Sand Lake Basin was carried out by using remote sensing image maps. Cellular Automata (CA) model was used to predict land use change from 2011 to 2015. The CA prediction results were combined with non-point source models to predict the water quality of the Shahu Basin The spatial and temporal distribution of total nitrogen (TN), total phosphorus (TP) and biochemical oxygen demand (BOD) load of non-point source pollutants was studied.The results show that from 2003 to 2010, the area of construction land continued to expand and the conversion rate of other types of land to construction land Followed by: 56.8% of farmland, 35.1% of green land, 23.9% of water area and 8.9% of unused land. All types of land use have the trend to continue to change from 2011 to 2015. From the perspective of changes in total pollutant load, The total load of the three pollutants in 2015 increased significantly compared with that in 2003, of which: TN increased by 30.11%, TP increased by 17.32% and BOD increased by 43.38% .From the point of spatial distribution of total pollutant load, TN was changed from construction land> green space> farmland> unutilized land in 2003 to construction land in 2015> unutilized land> farmland> green space. The spatial distribution of total pollution load of TP and BOD in 2015 was in line with 2003 , As follows: construction land> unused land> farmland> green land.