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Entropy 2019, 21(1), 53; https://doi.org/10.3390/e21010053

Scaling Effects of Elevation Data on Urban Nonpoint Source Pollution Simulations

State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
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Received: 3 December 2018 / Revised: 23 December 2018 / Accepted: 2 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Entropy and Scale-Dependence in Urban Modelling)
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Abstract

The scale effects of digital elevation models (DEM) on hydrology and nonpoint source (NPS) pollution simulations have been widely reported for natural watersheds but seldom studied for urban catchments. In this study, the scale effect of DEM data on the rainfall-runoff and NPS pollution was studied in a typical urban catchment in China. Models were constructed based on the DEM data of nine different resolutions. The conventional model performance indicators and the information entropy method were applied together to evaluate the scale effects. Based on the results, scaling effects and a resolution threshold of DEM data exist for urban NPS pollution simulations. Compared with natural watersheds, the urban NPS pollution simulations were primarily affected by the local terrain due to the overall flat terrain and dense sewer inlet distribution. The overland process simulation responded more sensitively than the catchment outlet, showing prolonged times of concentration for impervious areas with decreasing DEM resolution. The diverse spatial distributions and accumulation magnitudes of pollutants could lead to different simulation responses to scaling effects. This paper provides information about the specific characteristics of the scale effects of DEM data in a typical urban catchment, and these results can be extrapolated to other similar catchments as a reference for data collection. View Full-Text
Keywords: DEM data; scale effect; urban pollution; nonpoint source pollution; information entropy DEM data; scale effect; urban pollution; nonpoint source pollution; information entropy
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Dai, Y.; Chen, L.; Zhang, P.; Xiao, Y.; Shen, Z. Scaling Effects of Elevation Data on Urban Nonpoint Source Pollution Simulations. Entropy 2019, 21, 53.

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