Dynamic processes of hyporheic exchange and temperature distribution in the riparian zone in response to dam-induced water fluctuations

Dongsheng Liu; Jian Zhao; Xiaobing Chen; Yingyu Li; Shipan Weiyan; Mengmeng Feng

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자료유형: 학술저널

저자정보: Dongsheng Liu (Hohai University China) Jian Zhao (Hohai University China) Xiaobing Chen (Hohai University China) Yingyu Li (Hohai University China) Shipan Weiyan (Hohai University China) Mengmeng Feng (Hohai University China)

저널정보: 한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.22 No.3

발행연도: 2018.1

수록면: 465 - 475 (11page)

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연구주제

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연구배경

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연구방법

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We examined the dynamic processes of hyporheic exchange and temperature distribution in a riparian zone in response to low-temperature water fluctuations downstream of the Xin’an River Dam, China, using analytical and mainly hydrodynamic methods. For this purpose, we installed six HM21 piezometers (R, P1–P5) between the river water and the groundwater at an interval of approximately 2 m perpendicular to the flow path. We also installed 20 PT100 thermistors (T1–T20) along the transect at depths of 1.19 m to 3.58 m and monitored the temperatures of river and air. Water levels and temperatures were automatically logged every 5 min by the real-time system from November to December 2014 and sent to the remote platform through the remote terminal unit. Results revealed that the intensity and direction of the hyporheic exchange (Q) between the river water and the groundwater varied periodically (t = 1 d) with the water level of the river. In each cycle, the Q was in a counterclockwise loop curve with the water level of the river and with the non-uniform distribution along the transect perpendicular to the river, which showed that the farther the lateral exchange was away from the river, the lower its intensity and the more hysteretic the alteration of its direction. The daily exchange width and residence time had no necessary connection with the average river stage, but mainly depended on the amplitude of the fluctuating river stage and the duration of river infiltration and established a strong linear relationship with their product. The temperature distribution of the riparian aquifer was mainly affected by the surface radiation and river water infiltration. It was characterized as “cool on the surface and warm at the bottom” in the vertical direction and could be divided into low-, medium-, and high-temperature zones along the horizontal direction. The horizontal infiltration distance (L) increased by power functions with the increase in infiltration rate (v) and decrease in river temperature (T).

참고문헌 (24)

참고문헌 신청

Arntzen, E.V. / 2006 / Effects of fluctuating river flow on groundwater/surface water mixing in the hyporheic zone of a regulated, large cobble bed river / River Research and Applications 22:937~946

Curry, R.A. / 1994 / Effects of river flow fluctuations on groundwater discharge through brook trout, Salvelinus fontinalis, spawning and incubation habitats / Hydrobiologia 277:121~134

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Cardenas, M.B. / 2010 / Lessons from and assessment of Boussinesq aquifer modeling of a large fluvial island in a dam-regulated river / Advances in Water Resources 33:1359~1366

Casado, A. / 2013 / Influence of dam-induced hydrological regulation on summer water temperature: Sauce Grande River, Argentina / Ecohydrology 6:523~535

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