Combining the digital filtering method with the SWAT model to simulate spatiotemporal variations of baseflow in a mountainous river basin

IF 4.7 2区 地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2024-09-10 DOI:10.1016/j.ejrh.2024.101972
Hongxin Duan , Lian Li , Zhigang Kong , Xuchun Ye
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Abstract

Study region

Ganjiang River Basin, a typical mountainous river basin which located on the south bank of the middle-lower Yangtze River. The Ganjiang River is the seventh largest tributary of the Yangtze River.

Study focus

Baseflow, a key recharge source for the river streamflow. This study combined the digital filtering method with the SWAT model to examine the temporal and spatial patterns of baseflow across the Ganjiang River Basin, and quantitatively assessed land use change impact on baseflow.

New hydrological insights for the region

Baseflow in the Ganjiang River Basin shows a "single peak" intra-annual distribution. Monthly variations of streamflow and baseflow across the basin are different. The variation of baseflow index is generally opposite to that of streamflow. A positive correlation has been noted between the annual baseflow and streamflow, while a negative correlation was found between the annual baseflow index and precipitation. Due to the potential influence of basin topography, river flow direction and rock layer distribution, baseflow and baseflow modulus showed a spatially increasing trend from south to north, with the northwest region having extremely strong groundwater recharge. In comparison to the basic scenario, under extreme land use scenarios of forest, grassland, and cropland, baseflow may experience an increase of 14.7 % and 2.9 %, while witness a decrease of 13.9 %. All results improve the understanding of baseflow spatiotemporal variations in river basins.

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将数字滤波法与 SWAT 模型相结合,模拟山区河流流域基流的时空变化
研究区域赣江流域位于长江中下游南岸,是典型的山区河流流域。研究重点基流是河流径流的重要补给源。本研究将数字滤波方法与 SWAT 模型相结合,研究了赣江流域基流的时空格局,并定量评估了土地利用变化对基流的影响。对该地区的水文新认识赣江流域的基流呈现出 "单峰 "年际分布。赣江流域的基流呈现出 "单峰 "年际分布特征,全流域流量和基流的月变化各不相同。基流指数的变化一般与径流量的变化相反。年基流与溪流之间呈正相关,而年基流指数与降水之间呈负相关。由于盆地地形、河流流向和岩层分布的潜在影响,基流和基流模数在空间上呈现由南向北递增的趋势,西北部地区地下水补给极强。与基本情景相比,在森林、草地和耕地等极端土地利用情景下,基流可能增加 14.7% 和 2.9%,同时减少 13.9%。所有结果都加深了人们对流域基流时空变化的理解。
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来源期刊
Journal of Hydrology-Regional Studies
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.
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