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Investigating the effects of groundwater level changes on GNSS observations in the Konya Closed Basin
Investigación de los efectos del cambio en el nivel de aguas subterráneas a partir de observaciones de sistemas globales de navegación por satélite en la Cuenca de Konya, Turquía
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https://doi.org/10.15446/esrj.v25n4.92490Keywords:
Konya Closed Basin, GNSS Time Series Analysis, Fast Fourier Transform, Groundwater Level (en)Cuenca Konya; Sistemas Globales de Navegación por Satélite; análisis de series temporales; Transformada rápida de Fourier; nivel de aguas subterráneas (es)
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The Konya Closed Basin (KCB) that inhabited by approximately 4 million people has a semi-arid climate and has been an important agricultural and economic production area with its alluvial fertile soils. In recent years, the use of groundwater as a main source in the intense need for irrigation in the basin due to climate change, drought and wrong agricultural policies triggered land subsidence in the basin by causing the aquifer system compaction. In this study, the effects of groundwater level changes obtained from groundwater monitoring stations on the positions of continuously operating GNSS stations located in KCB were investigated by time series analysis. As a result of trend component analyses of time series processed based on the ITRF08 fixed frame, it was determined that the horizontal positions of stations in this region were moving in the northeast direction (18.88 mm/year). For the up coordinates, while stations ANRK, KLUU, and NIGD had movements (0.56 mm/year) in the up direction, the other stations moved in the down direction. The vertical movement of KNY1 station based on 560-day data was in the down (-) direction, with an annual movement of 70.96 mm, and this was the maximum movement or velocity compared to the other stations in this region. The trend analysis of 19 wells revealed linear groundwater level changes in the down direction with a mean value of -39.22 cm/year. The decrease in the water level of the wells in the Konya Closed Basin was statistically significant for the majority of the wells and at meter level in some wells. It was determined that the linear decrease was generally caused by the reduced level of groundwater in this region. The periodic component analysis showed that the movements of the GNSS stations changed from a day to a year due to several factors, such as atmospheric and hydrological loading and climatic effects.
La Cuenca de Konya, habitada por cerca de cuatro millones de personas, tiene un clima semiárido y ha sido una importante área de producción agrícola y económica con sus fértiles suelos aluviales. En los años recientes, el uso de las aguas subterráneas para satisfacer la demanda de irrigación, en un contexto de cambio climático, sequía y políticas agriculturales erróneas, ha ocasionado la subsidencia de los suelos en la cuenca a través de la compactación del sistema acuífero. En este estudio se investigan a través del análisis de series temporales los efectos en los cambios de los niveles de aguas subterráneas obtenidos de las estaciones de monitoreo en la cuenca que operan continuamente con sistemas globales de navegación por satélite (GNSS, Global Navigation Satellite System). Como resultado del análisis del componente de tendencia en las series temporales con base en el marco ajustado ITRF08 se determinó que las posiciones horizontales de las estaciones en esta área se movieron en la dirección noreste (18.74 mm/year). En las coordenadas superiores las estaciones ANRK, KLUU, y NIGD tienen movimientos de 0.56 mm por año hacia arriba, mientras que las otras estaciones se mueven hacia abajo. El movimiento vertical de la estación KNY1 de acuerdo con la información de 560 días fue hacia abajo, con un movimiento anual de 70,96 mm. Este fue el máximo movimiento o velocidad comparado con las otras estaciones. El análisis de tendencia de 19 pozos revela los cambios lineales de aguas subterráneas hacia abajo con una media de -39.22 centímetros por año. El descenso en el nivel del agua de los pozos de la Cuenca Konya fue estadísticamente significante para la mayoría de los pozos y en el nivel métrico de algunos pozos. Se determinó que el descenso lineal fue causado generalmente por la reducción del nivel de aguas subterráneas en la región. El análisis del componente relacionado a la frecuencia muestra que los movimientos de las estaciones GNSS cambian desde un día hasta un año debido a varios factores como la carga atmosférica e hidrológica y los efectos climáticos.
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1. Artur Lenczuk, Anna Klos, Janusz Bogusz. (2023). Studying spatio-temporal patterns of vertical displacements caused by groundwater mass changes observed with GPS. Remote Sensing of Environment, 292, p.113597. https://doi.org/10.1016/j.rse.2023.113597.
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