Enhancing the capability of hydrological models to simulate the regional agro-hydrological processes in watersheds with shallow groundwater: Based on the SWAT framework

Xiong, Lvyang; Xu, Xu; Ren, Dongyang; Huang, Quanzhong; Huang, Guanhua

doi:10.1016/j.jhydrol.2019.02.043

Cited by 26 publications

(28 citation statements)

References 60 publications

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“…In M-SWAT, we assume the lateral exchange happens rapidly enough to achieve the same groundwater levels for different HRUs within a sub-basin. Thus, the balance equations (Equations ( 16)-( 17)) are applied to estimate the change in groundwater storage at the sub-basin scale (Xiong et al, 2019). The daily GWD on day j in the k th HRU is calculated by Equation ( 18).…”

Section: Groundwater-balance Modulementioning

confidence: 99%

“…The groundwater concentration is not calculated in M-SWAT and is required to be specified by users. This is because the groundwater concentration is relatively stable and easy to monitor (as shown in Annex C) compared with soil salt concentration, and it is also very difficult to calculate the groundwater concentration when the aquifer is thick (Xiong et al, 2019).…”

Section: Groundwater-balance Modulementioning

confidence: 99%

“…of Hetao (Ren et al, 2018;Xiong et al, 2019). The region has an arid to semi-arid continental climate with average annual precipitation and pan evaporation (20 cm pan) of 160 and 2240 mm, respectively, from 1981 to 2009 (Ren et al, 2016).…”

Section: Case Study Area and Data Collectionmentioning

confidence: 99%

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A modified SWAT model for mechanistic simulation of soil water‐salt transport and the interactions with shallow groundwater

Mu,

Xun,

Gao

et al. 2023

Hydrological Processes

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Current hydrological models still face difficulties in accurately simulating vadose zone (VZ) hydrological processes in arid watersheds with shallow groundwater environments. Therefore, this article introduces a new mechanistic VZ module coupled with an improved groundwater‐balance (GWB) module to enhance the capabilities of the well‐known Soil Water Assessment Tools (SWAT) model. The main improvements and features of the modified SWAT model (M‐SWAT) include: a numerical VZ module to accurately simulate soil water‐salt transport under variably saturated conditions by solving the head‐formed Richards' equation and advection‐dispersion equation; a GWB module (on a sub‐basin scale for shallow aquifer) coupled with VZ module by proposing an effective way of boundary information exchanges; and a more reasonable water‐salt stress functions (i.e., based on matric head and osmotic head) to calculate root water uptake and plant growth. The M‐SWAT was then tested and evaluated with two‐year observation data from the Yangchang canal command area (YCA, an experimental site) and the Jiyuan Irrigation System (Jiyuan, region‐scale), located in the arid upper Yellow River basin of northwest China. The model produced a good agreement between the simulated and observed data in both calibration and validation with sufficiently small root mean square error (RMSE). The determination coefficient (R2) was greater than 0.51, 0.36, and 0.87 in simulating the soil water‐salt dynamics, groundwater depth fluctuations, and leaf area index development, respectively. Case testing also proved that the M‐SWAT had sufficient computational efficiency and stability for regional application. Further comparisons with previous studies indicated that the M‐SWAT could more accurately and rationally simulate the soil water‐salt dynamics and their interactions in arid watersheds with shallow groundwater tables.

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Section: Groundwater-balance Modulementioning

confidence: 99%

Section: Groundwater-balance Modulementioning

confidence: 99%

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A modified SWAT model for mechanistic simulation of soil water‐salt transport and the interactions with shallow groundwater

Mu,

Xun,

Gao

et al. 2023

Hydrological Processes

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“…(2.55-11.5 dS m −1 ) and various leaching fractions (10%-50% of yield reduction), and irrigation amounts. At a larger scale, Xiong et al (2019) modified the SWAT model by further introducing a soil salinity stress coefficient (K s-sal ) to limit crop transpiration and growth based on a modification of the FAO56 approach follows:…”

Section: Modeling Applications Of the Fao56 Approach Using Single And Dual Crop Coefficientsmentioning

confidence: 99%

Coping with salinity in irrigated agriculture: Crop evapotranspiration and water management issues

Minhas

Ramos

Ben‐Gal

et al. 2020

Agricultural Water Management

241

133

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Soil and water salinity and associated problems are a major challenge for global food production. Strategies to cope with salinity include a better understanding of the impacts of temporal and spatial dynamics of salinity on soil water balances vis-à-vis evapotranspiration (ET) and devising optimal irrigation schedules and efficient methods. Both steady state and transient models are now available for predicting salinity effects on reduction of crop growth and means for its optimization. This paper presents a brief review on the different approaches available, focusing on the FAO56 framework for coping with the effects of soil salinity on crop ET and yields. The FAO56 approach, applied widely in soil water balance models, is commonly used to compute water requirements, including leaching needs. It adopts a daily stress coefficient (K s ) representing both water and salt stresses to adjust the crop coefficient (K c ) when it is multiplied by the grass reference ET o to obtain the actual crop ET values for saline environments (ET c act = K s K c ET o ). The same concept is also applied to the dual K c approach, with K s used to adjust the basal crop coefficient (K cb ). A review on applications of K s is presented showing that the FAO56 approach may play an interesting role in water balance computations aimed at supporting irrigation scheduling. Transient state models, through alternative formulations, provide additional solutions for quantification of the salinity build-up in the root zone. These include irrigation-induced salinity, upward movement of salts from saline ground water-table, and sodification processes. Regardless of the approach, these models are now very much capable of supporting irrigation water management in saline stress conditions. For maintaining crop growth under salinity environments, soil-crop-water management interventions consistent with site-specific conditions are then discussed. Adequateness of irrigation methods, cyclic uses of multi-salinity waters and proper irrigation scheduling are further analyzed as examples of efficient means to obviate the effects of salinity.

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“…Shallow groundwater systems are commonly observed in many regions and play a significant role in crop and natural vegetation growth (Fan et al., 2013; Karimov et al., 2014; Loheide, 2008; Nachabe, 2002; Xiong et al., 2019). The knowledge of shallow water table dynamics is extremely important for the reasonable management of crops and natural vegetation in such areas.…”

Section: Introductionmentioning

confidence: 99%

Analytical Expressions of Drainable and Fillable Porosity for Layered Soils Under Shallow Groundwater Environments

Xiao

2022

Water Resources Research

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Analytical expressions of drainable and fillable porosity for layered soils were proposed under vertical fluxes conditions • Expressions of drainable/fillable porosity for layered soils with large water table fluctuations were derived under hydrostatic conditions • Expressions were useful to improve the application performance of subsurface modeling and groundwater estimation for layered soils Supporting Information:

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Enhancing the capability of hydrological models to simulate the regional agro-hydrological processes in watersheds with shallow groundwater: Based on the SWAT framework

Cited by 26 publications

References 60 publications

A modified SWAT model for mechanistic simulation of soil water‐salt transport and the interactions with shallow groundwater

A modified SWAT model for mechanistic simulation of soil water‐salt transport and the interactions with shallow groundwater

Coping with salinity in irrigated agriculture: Crop evapotranspiration and water management issues

Analytical Expressions of Drainable and Fillable Porosity for Layered Soils Under Shallow Groundwater Environments

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