Fall of Unconfined Groundwater Level Caused by Change of Ground Cover Condition in Miyazaki City

Sugio, Satoru; Eto, Mika; Imayama, Kiyoshi; Deguchi, Chikashi; Suharyanto, Agus

doi:10.5917/jagh1987.41.253

Cited by 3 publications

(1 citation statement)

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“…In recent years, of the paddy-upland crop rotation has been conducted at the around 30% of total paddy fields. The decrease in paddy field areas has likely caused a decrease in the amount of groundwater recharge and decline of the groundwater level (Sugio et al 1999;Watanabe et al 2002;Khan et al 2010). Clarifying the extent to which the decline in paddy field area affects the groundwater level is important to maintaining sustainable groundwater use.…”

Section: Introductionmentioning

confidence: 99%

Assessment of factors influencing groundwater-level change using groundwater flow simulation, considering vertical infiltration from rice-planted and crop-rotated paddy fields in Japan

et al. 2014

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Assessing factors, such as land use and pumping strategy, that influence groundwater levels is essential to adequately manage groundwater resources. A transient numerical model for groundwater flow with infiltration was developed for the Tedori River alluvial fan (140 km 2), Japan. The main water input into the groundwater body in this area is irrigation water, which is significantly influenced by land use, namely paddy and upland fields. The proposed model consists of two models, a one-dimensional (1-D) unsaturated-zone water flow model (HYDRUS-1D) for estimating groundwater recharge and a 3-D groundwater flow model (MODFLOW). Numerical simulation of groundwater flow from November 1975 to 2009 was performed to validate the model. Simulation revealed seasonal groundwater level fluctuations, affected by paddy irrigation management. However, computational accuracy was limited by the spatiotemporal data resolution of the groundwater use. Both annual groundwater levels and recharge during the irrigation periods from 1975 to 2009 showed long-term decreasing trends. With the decline in rice-planted-paddy field area, groundwater recharge cumulatively decreased to 61 % of the peak in 1977. A paddy-upland crop rotation system could decrease groundwater recharge to 2-27 % relative to no crop rotation system.

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Section: Introductionmentioning

confidence: 99%

Assessment of factors influencing groundwater-level change using groundwater flow simulation, considering vertical infiltration from rice-planted and crop-rotated paddy fields in Japan

et al. 2014

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Spatiotemporal variation in groundwater level within the Manas River Basin, Northwest China: Relative impacts of natural and human factors

Yang

Tian

et al. 2021

Open Geosciences

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The Manas River Basin (MRB), Northwest China, is an arid basin dependent on irrigation for agriculture, and human activities are believed to be the primary factor affecting the groundwater level fluctuations in this basin. Such fluctuations can have a significant adverse impact on the social economy, agricultural development, and natural environment of that region. This raises concerns regarding the sustainability of groundwater use. In this study, we used ArcGIS spatial interpolation and contrast coefficient variance analysis to analyse groundwater level, land-use change, and water resource consumption patterns from 2012 to 2019 in the plains of the MRB. The aim was to determine the main factors influencing the groundwater level and to provide a scientific basis for the rational development, utilisation, and management of water resources in this area. During the study period, the groundwater level decreased, increased, and then fluctuated with a gradually slowing downward trend; the decline ranged from −17.82 to −11.67 m during 2012–2019. Within a given year, groundwater levels declined from March/April to August/September, then rose from August/September to March/April, within a range of 0.29–19.05 m. Primary factors influencing the groundwater level included human activities (e.g., changes in land use, river regulation, irrigation, and groundwater exploitation) and natural causes (e.g., climate and weather anomalies). Human activities were the primary factors affecting groundwater level, especially land-use change and water resource consumption. These results provide a theoretical basis for the rational exploitation of groundwater and the optimisation of water resource management in this region.

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Assessment of Factors Influencing Groundwater Level Changes During Irrigation in the Tedori River Fan Based on Steady State Groundwater Flow Analysis

Iwasaki

Ozaki

Nakamura

et al. 2013

JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

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Fall of Unconfined Groundwater Level Caused by Change of Ground Cover Condition in Miyazaki City

Cited by 3 publications

References 1 publication

Assessment of factors influencing groundwater-level change using groundwater flow simulation, considering vertical infiltration from rice-planted and crop-rotated paddy fields in Japan

Assessment of factors influencing groundwater-level change using groundwater flow simulation, considering vertical infiltration from rice-planted and crop-rotated paddy fields in Japan

Spatiotemporal variation in groundwater level within the Manas River Basin, Northwest China: Relative impacts of natural and human factors

Assessment of Factors Influencing Groundwater Level Changes During Irrigation in the Tedori River Fan Based on Steady State Groundwater Flow Analysis

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