Changchun GI products Geography IWRM LULC change simulation Lanzhou-Xining urban agglomeration PLUS model Research & information: general SD model Switzerland Xinxing County adaptive management aerial photo interpretation best management practices construction land development intensity construction land use benefit county area coupling and coordination relationship decision support system development priorities downscaling approach experimental watershed study design expert system flood flows flooding functional urban land future scenarios geographic information system hydrological model hydrological response