Effects of irrigation and canal networks on groundwater–land surface interactions in the middle Heihe River Basin, China

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-06-19 DOI:10.1016/j.ejrh.2025.102532

Zheng Lu , Shuyan Peng , Tingting Wu , Jiaxin Lei , Jiaxing Wei , Xiaofan Yang

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引用次数: 0

Abstract

Study region

Heihe River Basin, a typical endorheic river basin in northwest China.

Study focus

Agriculture is the highest water-consuming sector, utilizing approximately 70 % of available water resources, predominantly for irrigation purposes. However, limited studies have explicitly diagnosed the role of agriculture managements (such as irrigation and canal networks) on the water–energy cycles of the agriculture system. This study presents a suite of numerical experiments to analyze the effects of irrigation and canal networks on groundwater–land surface interactions using a 3D, fully integrated hydrologic model. The model has been validated against both observations and spatially distributed products, confirming its reliability in simulating regional hydrologic dynamics.

New hydrologic insight for the region

The findings reveal that irrigation expanded the shallow water table depths (WTD) zone by 30 % and increased summer and fall streamflow by approximately 10 %. Additionally, irrigation substantially reduced soil temperature at WTD of 0.01–10 m (i.e., cooling effect), altering the strong correlations between water table depth and latent heat flux. Moreover, irrigation canals heightened streamflow peaks, and increased spatial variability in surface heat flux differences, particularly in sensible heat flux, even causing localized reversals. This study provides scientific evidence in understanding the role of agriculture activities in local water resources management.

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黑河中游灌渠网络对地下水-地表相互作用的影响

研究区域黑河流域是中国西北地区典型的内河流域。农业是用水量最高的部门，利用了大约70% %的可用水资源，主要用于灌溉目的。然而，有限的研究明确地诊断了农业管理（如灌溉和运河网络）在农业系统水能循环中的作用。本研究提出了一套数值实验来分析灌溉和运河网络对地下水-陆地表面相互作用的影响，使用三维，完全集成的水文模型。该模型已通过观测和空间分布产品进行了验证，证实了其在模拟区域水文动态方面的可靠性。研究结果表明，灌溉使浅层地下水位深度（WTD）区扩大了30 %，夏季和秋季的流量增加了约10 %。此外，灌溉显著降低了WTD 0.01 ~ 10 m的土壤温度（即降温效应），改变了地下水位与潜热通量之间的强相关性。此外，灌渠增加了水流峰值，增加了地表热通量差异的空间变异性，特别是感热通量差异，甚至导致局部逆转。本研究为理解农业活动在地方水资源管理中的作用提供了科学依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.