An automatic ordering method for streams in surface-water/groundwater interaction modeling

Xu, Chengcheng; Asaṅga,; Li, Tianchen; Lu, Chuiyu; He, Xin; Sun, Qingyan; Qin, Tao; Yan, Lingjia

An automatic ordering method for streams in surface-water/groundwater interaction modeling | Une méthode d’ordonnancement automatique des cours d’eau dans la modélisation de l’interaction entre les eaux de surface et les eaux souterraines Un método de ordenamiento automático de los cursos de agua para la modelación de la interacción agua superficial/agua subterránea 地表水和地下水相互作用模拟中河流的自动排序方法 Um método de ordenação automática para córregos na modelagem de interação de águas superficiais e subterrâneas

2022

The widely used groundwater flow model MODFLOW offers a range of software packages to simulate the interaction between streams and groundwater in aquifer systems. However, these existing packages lack a general method to address the chaotic simulation sequences of stream segments and require these segments to be ordered by modelers as input to the code. Therefore, it is challenging to simulate a stream network divided into a large number of segments such as a canal irrigation system. In this study, the Streamflow Automatic Routing (SAR) package was developed, and an effective method is proposed to automatically determine the segment simulation sequence. The stream segment order in the SAR input file is arbitrary, which allows modifications of the stream network by removing segments directly and adding segments at the end of the segment group. This mainly includes two processes: scanning all the outlet channels of the water system and calling the recursive algorithm for each outlet channel of the water system. The SAR package was tested using a hypothetical stream–aquifer system and applied to a complex flow field in Aiding Lake of Turpan Basin, China. In the results, a close fitting between the simulation and observations shows that the SAR package precisely simulated the exchange flux between the steams and aquifer. The SAR package can significantly improve the efficiency of simulations in a complex stream network, and it can be widely used as a subroutine package of MODFLOW in agricultural irrigation areas where rivers and canals are interlaced.

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