Changes of vertical groundwater recharge with increase in thickness of vadose zone simulated by one-dimensional variably saturated flow model

Huo, Siyuan; Jin, Menggui; Liang, Xing; Lin, Dong

doi:10.1007/s12583-014-0486-7

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…Therefore, the term "time lag" may be misleading if the investigating target, soil water displacement or wetting front propagation, is not specified. Some researchers use the term to refer to soil water residence time (Mcmahon et al, 2006;Scanlon et al, 2010;Fenton et al, 2011), whereas others use it to express the water level response time (Mattern and Vanclooster, 2010;Huo et al, 2014). However, the difference between soil water residence time and water level response time is obvious.…”

Section: The "Recharge Lag" Effectsmentioning

confidence: 99%

Groundwater recharge under irrigated agro-ecosystems in the North China Plain: From a critical zone perspective

Min

Shen

et al. 2019

J. Geogr. Sci.

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From a critical zone perspective, the present paper aims to present the magnitude of groundwater recharge under different agricultural land-use types, reveal the process of water and solute transport in thick vadose zone, evaluate the "time lag" effect of recharge, and underscore the role of thickening vadose zone in recharge. The results indicated that different agricultural land-use types need to be further considered in recharge rate estimate. Under the typical irrigation condition in the piedmont plain, the recharge rate under flood irrigated winter wheat and summer maize (W/M_F), maize (M), non-cultivation (NC), native vegetation (NV), vegetables (V), and orchards (O) is 206.

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Section: The "Recharge Lag" Effectsmentioning

confidence: 99%

Groundwater recharge under irrigated agro-ecosystems in the North China Plain: From a critical zone perspective

Min

Shen

et al. 2019

J. Geogr. Sci.

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“…CC BY 4.0 License. m (e.g., North China Plain, (Huo et al, 2014)) and 700 years for d=1000 m (e.g., Yucca Mountain Site, (Flint et al, 2001)) with loam soil. This result suggests that we should be very careful to deal with simulation with a long unsaturated profile, where the UIC can exist an extremely long time and influence the simulation/data assimilation results.…”

Section: B the Influence Of Soil Profile Length 305mentioning

confidence: 99%

On the uncertainty of initial condition and initialization approaches in variably saturated flow modeling

Yu¹,

Shi²

2018

Preprint

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Abstract. Soil water movement is quite important due to its direct effects on environment, agriculture and hydrology. Simulation of soil water movement requires accurate determination of model parameters as well as initial and boundary conditions. However, it is difficult to obtain the accurate initial soil moisture/matric potential profile at the beginning of simulation time, making it necessary to run the simulation model from arbitrary initial condition until the uncertainty of initial condition (UIC) is diminished. The behavior of this process is usually defined as “warming up”. In this paper, two common methods in quantifying the UIC (one is based on running a single simulation recursively across multiple hydrological years, and the other is based on Monte-Carlo simulations with various initial condition) are compared and the required “warm-up” time twu (minimum time required for model to warm up to eliminate the UIC) is identified with different soil textures, meteorological conditions, and soil profile lengths. Then we analyze the effects of different initial conditions on parameter estimation within two data assimilation frameworks (i.e, ensemble Kalman filter and iterative ensemble smoother), and assess several existing model initializing methods to obtain initial condition based on the availability of data related to the retrieval of initial soil moisture profile. Results reveal that Monte-Carlo simulations and the recursive simulation over many years can both demonstrate the temporal behavior of UIC and a common threshold is recommended to determine the warm-up time for both methods. Besides, the relationship between warm-up time for variably saturated flow modeling and the model settings (soil textures, meteorological conditions and soil profile length) are quantitatively identified. In addition, we propose a “warm-up” period before assimilating data in order to obtain a better performance of parameter and state estimation.

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“…For example, Wang et al [24] found that K S , θ s , and n significantly affected soil water, and the range of cumulative infiltration was above 10%. Huo and Jin [25] demonstrated that K S , θ s , and n produced a higher contribution to water flow as a single factor, and K S and n had a positive effect on soil water infiltration. Stothoff [26] examined the sensitivity of a bare soil simulator using an effective semi-infinite column and revealed that the reduction in air entry pressure (the inverse of α) could promote long-term average net infiltration for homogeneous media.…”

Section: Introductionmentioning

confidence: 99%

“…Soil hydraulic parameters can influence the medium transportation and transformation processes of water in soils [22]. Previous studies [23][24][25][26][27][28][29] stated that hydraulic conductivity (K S and K) and the SWCC parameters (θ s , α, n, and m) are the key factors of soil water flow. Fan et al [23] reported that K S had a significant influence on cumulative infiltration, with a 46-fold reduction in infiltration duration when K S increased from 0.0043 to 0.2432 cm min −1 .…”

Section: Introductionmentioning

confidence: 99%

Irrigation Salinity Affects Water Infiltration and Hydraulic Parameters of Red Soil

Tan,

Su,

Jiang

et al. 2023

Agronomy

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Unconventional water resources (e.g., saline water, etc.) for irrigation as a promising supplementary water source can alleviate the freshwater shortage in the agriculture of red soil areas in Southern China. It should be noted that the presence of soluble salt in this water source may have detrimental influences on soil water infiltration and crop growth. Understanding the effect of unconventional water irrigation (UWI) on water infiltration in red soil is important. Previous studies have shown that the salinity of UWI can alter soil hydraulic properties to change soil water movement in saline soils. However, the underlying mechanism and factors of water infiltration in red soil under UWI with different salinity levels remain limited. Therefore, a laboratory experiment (one-dimensional vertical infiltration experiment and centrifuge method) was conducted to evaluate the effect of UWI with different salinity levels [0 (the distilled water, CK), 1 (S1), 2 (S2), 3 (S3), 5 (S5), and 10 (S10) g L−1] on the soil water infiltration process, soil water characteristic curve (SWCC), soil water constants estimated using the SWCC, saturated and unsaturated hydraulic conductivity (KS and K) as well as the soil chemistry of soil profile [pH, electrical conductivity (EC), and Na+ and Cl− contents]. The primary factors of soil water infiltration were identified using stepwise regression and path analysis methods. The results showed that UWI salinity decreased water infiltration by 1.53–7.99% at the end of infiltration in red soil, following the order of CK > S1 > S5 > S2 > S3 > S10. Moreover, UWI could enhance soil water availability with an increase of 8.55–12.68% in available water capacity. In contrast, lower KS and K were observed in S1–S10, and there was a negative linear relationship between irrigation salinity and KS. UWI also produced the EC, Na+, and Cl− accumulations in the soil profile. As the salinity level of UWI increased, the accumulations aggravated. Soil acidification was found in S1–S5, while soil alkalization was observed in S10. Additionally, α, PWP, and KS were the primary factors influencing the water infiltration of red soil. This study can help optimize the soil infiltration model under UWI and establish a foundation for unconventional water management in the red soil regions of Southern China and other similar regions. In addition, the undisturbed red soil under agricultural unconventional water irrigation and the long-term effect of unconventional water application should be considered.

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Changes of vertical groundwater recharge with increase in thickness of vadose zone simulated by one-dimensional variably saturated flow model

Cited by 19 publications

References 8 publications

Groundwater recharge under irrigated agro-ecosystems in the North China Plain: From a critical zone perspective

Groundwater recharge under irrigated agro-ecosystems in the North China Plain: From a critical zone perspective

On the uncertainty of initial condition and initialization approaches in variably saturated flow modeling

Irrigation Salinity Affects Water Infiltration and Hydraulic Parameters of Red Soil

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