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[1]YANG Guang,SU Xiaoling.Change of Groundwater Depth and Its Causes in Middle Stream of the Heihe River Basin Based on the Random Forest[J].Research of Soil and Water Conservation,2017,24(01):109-114.

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Change of Groundwater Depth and Its Causes in Middle Stream of the Heihe River Basin Based on the Random Forest

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 109-114 Column: Public date: 2017-02-28

Title:: Change of Groundwater Depth and Its Causes in Middle Stream of the Heihe River Basin Based on the Random Forest

Author(s):: YANG Guang, SU Xiaoling; College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: middle stream of the Heihe River Basin; groundwater depth; the random forest method; geostatistics

CLC:: P641.8;S273.4

DOI:: -

Abstract:: In order to provide useful references for the reasonable development and utilization, the distribution characteristics of groundwater depth and its causes in middle stream of the Heihe River Basin was examined. Based on the local groundwater depth data of 33 observation wells from 1985 to 2010, the spatiotemporal distribution characterisitcs of the groundwater depths were analyzed by using the geostatistics. The random forest method was used to investigate the change causes of groundwater depth. The results showed that the groundwater depths of the middle stream of the Heihe River Basin reduced from the south to the north. Before 2001 in Ganzhou District and 2004 in Linze County, the groundwater depths had an increase trend, respectively, afterwards both reduced. The groundwater depth of the northern Gaotai County presented the continuous decrease trend, but groundwater depth of the eastern Gaotai region increased. Moreover, according to the analysis of geostatistics, the sample of the groundwater depths had spatial correlations with middle-level, and its spatial anisotropy had enhancement tendency. In addition, the main factors influencing the groundwater depth in the middle stream of the Heihe River Basin were the utilization coefficient of canal system water, the exploitation quantity of the groundwater, surface water diversion quantity and evaporative capacity.

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