Effects of bedrock groundwater dynamics on runoff generation: a case study on granodiorite headwater catchments, western Tanzawa Mountains, Japan

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2020-01-01 DOI:10.3178/hrl.14.62

Yutaka Abe, Y. Uchiyama, M. Saito, Mitsuru Ohira, T. Yokoyama

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引用次数: 2

Abstract

: This study investigated runoff to clarify the effect of bedrock groundwater dynamics on runoff generation pro‐ cesses in granodiorite headwater catchments (NA and NB) located in the western Tanzawa Mountains, Central Japan. The rainfall–runoff response and water balance calculated using the hydrological cycle (HYCY) model with outflow were also analyzed based on the observed precipitation, runoff, and bedrock groundwater level (at a depth of 50 m). In 2013, the annual runoff rate was 398 mm (21% of the rainfall) in NA and 1209 mm (63% of the rainfall) in NB, respectively. The bedrock groundwater level varied for approximately 3 m, and responded to 30-mm rainfall events. The significant relationship between the base flow and bedrock groundwater level indicated that the bedrock groundwater markedly influenced base flow generation. The calculated annual bedrock infiltration values of 656 mm (34% of the rainfall) in NA and 52 mm (3% of the rainfall) in NB significantly influenced the runoff rate. Our results demonstrated that significant and negligible amounts of bedrock groundwater infiltration were observed, even in neighboring catchments. Those bedrock groundwater dynamics significantly influenced the observed differences in the runoff rate and base flow gener‐ ation.

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基岩地下水动态对径流生成的影响:以日本西部坦泽山花岗闪长岩源集水区为例

本研究对日本中部坦泽山脉西部花岗闪长岩源集水区(NA和NB)的径流进行了研究，以阐明基岩地下水动力学对产流过程的影响。基于实测降水、径流和基岩地下水位(50 m深)，利用HYCY模型计算出的降水-径流响应和水量平衡。2013年，NA区年径流量为398 mm(占降雨量的21%)，NB区为1209 mm(占降雨量的63%)。基岩地下水位变化约3 m，并响应30 mm降雨事件。基流与基岩地下水位的显著关系表明基岩地下水位对基流的产生有显著影响。计算得到的年基岩入渗值在北侧为656 mm(占降雨量的34%)，在北侧为52 mm(占降雨量的3%)，对径流速率有显著影响。我们的结果表明，即使在邻近的集水区，也观察到大量的基岩地下水渗入。这些基岩地下水动态显著影响了观测到的径流速率和基流生成的差异。

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

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.