Agglomeration 1 Backpropagation 1 China 1 Coordination degree 1 Coupling coordination degree 1 Coupling effect 1 Economic and social effects 1 Economy–Society–Environment system 1 Economy–society–environment system Environment systems 1 Neural networks 1 Normal distribution 1 River pollution 1 Rivers 1 Sales 1 Society environment 1 Sustainable development 1 Urban agglomerations 1 Urban growth 1 Urban sustainability 1 Yangtze Delta 1 Yangtze River Delta Urban Agglomeration 1 Yangtze river delta 1 Yangtze river delta urban agglomeration 1 agglomeration 1 environmental economics 1 spatial variation 1 spatiotemporal analysis 1 sustainable development 1 urban area 1