Assessing shallow groundwater level using RTI model and long-term MODIS data in Ejina Basin, Northwest China

2021 ◽  
Author(s):  
Dayou Luo ◽  
Xingping Wen ◽  
Junlong Xu ◽  
Haonan Zhang ◽  
SIHAPANYA Vongphet ◽  
...  
Keyword(s):  
Groundwater Level ◽  
Shallow Groundwater ◽  
Northwest China ◽  
Modis Data ◽  
Ejina Basin ◽  
Rti Model ◽  
Shallow Groundwater Level

scholarly journals Delineation of Hydraulic Flow Regime Areas Based on the Statistical Analysis of Semicentennial Shallow Groundwater Table Time Series

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 828 ◽  
Author(s):  
Tamás Garamhegyi ◽  
István Gábor Hatvani ◽  
József Szalai ◽  
József Kovács
Keyword(s):  
Climate Change ◽  
Time Series ◽  
Groundwater Level ◽  
Flow System ◽  
Shallow Groundwater ◽  
Water Levels ◽  
Discharge Zone ◽  
Long Term Changes ◽  
Shallow Groundwater Level

Shallow groundwater acts as an important source of water for the ecosystem, agriculture, drinking water supply, etc.; it is, however, among those water resources most sensitive to climate change, and especially to aridification. In the present study, the delineation of regional recharge and discharge zones of the Danube–Tisza Interfluve (Hungary, 8000 km2) is presented via the combination of multivariate time series and geomathematical methods to explore the subregions most sensitive to dewatering. The shallow groundwater level time series of 190 wells, covering a semicentennial period (1961 to 2010), were grouped into three validated clusters representing characteristically different subregions. Then, the subregions’ means and individual shallow groundwater level time series were investigated for long-term trends and compared with local meteorological variability (precipitation, evapotranspiration, etc.) to determine their regime characteristics. As a result, shallow recharge and discharge zones, a gravity-driven flow system, and the discharge zone of a deeper, overpressured flow system could be discerned with distinctive long-term changes in water levels. The semicentennial trends in shallow groundwater levels were significant (p < 0.05) in the recharge (−0.042 m y−1) and in the overpressured discharge zone (0.009 m y−1), and insignificant in the rest of the area (−0.005 m yr−1). The present results concur with previous findings from the area but provide a statistically sound and reproducible delineation of the regime areas on a much finer scale than before. With the determination of the different climatic processes driving the semicentennial trends prevailing in the shallow groundwater, the high vulnerability of the recharge zone is underlined, while the outlined overpressured flow system seems to act independently from semicentennial precipitation trends. This study provides a more in-depth picture of the long-term changes in shallow groundwater and its drivers in of one of the most important agricultural areas in Hungary. It outlines, in a generally applicable way, the most vulnerable subareas for irrigation relaying on shallow groundwater extraction. In addition, the results can help adaptation-strategy decision makers to initiate a more effective and area-focused intervention in the case of the predicted negative trends for vulnerable recharge areas under various climate change scenarios.

scholarly journals Spatial variability of shallow groundwater level in the Northern Kathmandu Valley

2018 ◽  
Vol 55 (1) ◽  
pp. 45-54
Author(s):  
Manish Shrestha ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Groundwater Level ◽  
Shallow Groundwater ◽  
Soil Surface ◽  
Northern Region ◽  
Dry Season ◽  
Kathmandu Valley ◽  
Wet Season ◽  
Geological Material ◽  
Groundwater Levels ◽  
Shallow Groundwater Level

Groundwater is the water which is present in pore spaces and in the fractures of the geological materials beneath earth surface. Water is incompressible substance and presence of small amount of water in geological material modifies the behavior of geological material under stresses. Determination of engineering behavior of the geological material is almost impossible skipping the role of water. The objective of this study was to map and evaluate shallow groundwater level of the northern Kathmandu Valley covering main rivers such as the Bagmati River, Bishnumati River, Dhobi Khola and the Manahara Khola. These rivers flow from the North to the South across the sand rich sediment zone. Static groundwater levels of 239 wells were measured from different locations of the study area in April/March 2017 (Dry Season) and in August 2017 (Wet Season). Shallow groundwater level was measured from soil surface to water level using well water depth logger (Qin and Li, 1998). The result showed that groundwater level ranged from 0.6 m to 12.5 m in dry season and 0.1 m to 13 m in wet season. The groundwater level increased by average of 34.68% (n = 235) as compared to that in dry season. Increase in the groundwater level suggests recharge of groundwater in wet season of the study area. The flow pattern of groundwater levels from the study shows flow of shallow groundwater towards the major rivers of that particular river watershed. As a consequence, seepage flow and piping erosion is likely along the riverbank slopes. Increase in recharge of groundwater during wet season exhibits that the northern region of the Kathmandu Valley is potential for groundwater recharge and can be used to manage water for the dry period.

Analysis on the Gravel Stratum Deformation by Dewatering

2007 ◽  
Vol 353-358 ◽  
pp. 3022-3025
Author(s):  
Wen Zhao ◽  
Yan Xu ◽  
Hai Xia Sun
Keyword(s):  
Particle Size ◽  
Groundwater Level ◽  
Large Particle ◽  
Ground Deformation ◽  
Dynamic Balance ◽  
Shallow Groundwater ◽  
Large Particle Size ◽  
Stress Deformation ◽  
Stratum Deformation ◽  
Shallow Groundwater Level

Large particle-size, shallow groundwater level, and large permeate coefficient are the characteristics of gravel stratum, which may results in large ground deformation. Ground deformation depends on several factors. Using the RFPA2D-Flow software exploited by the Center for Rock Instability and Seismic Research of Northeastern University (CRISR), the seepage-stress-deformation coupling rules of soil, which are influenced by different soil distributing, drawdown, enclosure and excavating, were analyzed, and the deformation of gravel in the dynamic balance due to the interaction between seepage and stress is studied.

scholarly journals Investigation of the climate-driven periodicity of shallow groundwater level fluctuations in a Central-Eastern European agricultural region

2017 ◽  
Vol 26 (3) ◽  
pp. 677-688 ◽  
Author(s):  
Tamás Garamhegyi ◽  
József Kovács ◽  
Rita Pongrácz ◽  
Péter Tanos ◽  
István Gábor Hatvani
Keyword(s):  
Groundwater Level ◽  
Shallow Groundwater ◽  
Eastern European ◽  
Agricultural Region ◽  
Groundwater Level Fluctuations ◽  
Central Eastern ◽  
Shallow Groundwater Level

Calculation Method of Natural Leymus chinensis Evapotranspiration under Shallow Groundwater Level Condition

2013 ◽  
Vol 807-809 ◽  
pp. 1644-1647
Author(s):  
Yan Wei Liu ◽  
Xiao Ping Han ◽  
Yu Long Jing
Keyword(s):  
Moisture Content ◽  
Groundwater Level ◽  
Shallow Groundwater ◽  
Water Transfer ◽  
Leymus Chinensis ◽  
Volumetric Moisture Content ◽  
Agricultural College ◽  
Swap Model ◽  
Open Test ◽  
Shallow Groundwater Level

Natural Leymus Chinensis evapotranspiration in the Otindag sandy area under shallow ground-water level condition is calculated based on Soil-Water-Atmosphere-Plant (SWAP) Model developed by Wageningen Agricultural College. The observed values in open test and interior experiment, the meteorological observation and crop index, and the data of soil volumetric moisture content in 2005, are used to calibrate parameters of SWAP model, determine and check out the water transfer parameters of SWAP model with soil volumetric moisture content in 2006. The result shows that SWAP model has high precision and can be use to simulate evapotranspiration under shallow groundwater level condition.

scholarly journals A simple prediction model for shallow groundwater level rise in natural slopes based on finite element solutions

2019 ◽  
Vol 56 (Special_Issue) ◽  
pp. 227-239 ◽  
Author(s):  
Akihiko WAKAI ◽  
Kyosuke HORI ◽  
Akino WATANABE ◽  
Fei CAI ◽  
Hiromi FUKAZU ◽  
...  
Keyword(s):  
Finite Element ◽  
Prediction Model ◽  
Groundwater Level ◽  
Shallow Groundwater ◽  
Natural Slopes ◽  
Shallow Groundwater Level

Deep Percolation and its Effects on Shallow Groundwater Level Rise Following Flood Irrigation

2007 ◽  
Vol 50 (1) ◽  
pp. 73-81 ◽  
Author(s):  
C. G. Ochoa ◽  
A. G. Fernald ◽  
S. J. Guldan ◽  
M. K. Shukla
Keyword(s):  
Groundwater Level ◽  
Shallow Groundwater ◽  
Deep Percolation ◽  
Flood Irrigation ◽  
Shallow Groundwater Level
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