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Statistical Modelling of Vertical Soil Moisture Profile: Coupling of Memory and Forcing

Author

Listed:
  • Manali Pal

    (Indian Institute of Technology Kharagpur)

  • Rajib Maity

    (Indian Institute of Technology Kharagpur)

  • Sayan Dey

    (Indian Institute of Technology Kharagpur)

Abstract

Information of Soil Moisture Content (SMC) at different depths i.e. vertical Soil Moisture (SM) profile is important as it influences several hydrological processes. In the era of microwave remote sensing, spatial distribution of soil moisture information can be retrieved from satellite data for large basins. However, satellite data can provide only the surface (~0–10 cm) soil moisture information. In this study, a methodological framework is proposed to estimate the vertical SM profile knowing the information of SMC at surface layer. The approach is developed by coupling the memory component of SMC within a layer and the forcing component from soil layer lying above by an Auto-Regressive model with an exogenous input (ARX) where forcing component is the exogenous input. The study highlights the mutual reliance between SMC at different depths at a given location assuming the ground water table is much below the study domain. The methodology is demonstrated for three depths: 25, 50 and 80 cm using SMC values of 10 cm depth. Model performance is promising for all three depths. It is further observed that forcing is predominant than memory for near surface layers than deeper layers. With increase in depth, contribution of SM memory increases and forcing dissipates. Potential of the proposed methodology shows some promise to integrate satellite estimated surface soil moisture maps to prepare a fine resolution, 3-dimensional soil moisture profile for large areas, which is kept as future scope of this study.

Suggested Citation

  • Manali Pal & Rajib Maity & Sayan Dey, 2016. "Statistical Modelling of Vertical Soil Moisture Profile: Coupling of Memory and Forcing," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 30(6), pages 1973-1986, April.
    • Handle: RePEc:spr:waterr:v:30:y:2016:i:6:d:10.1007_s11269-016-1263-4
    DOI: 10.1007/s11269-016-1263-4
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    References listed on IDEAS

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    1. I. Argyrokastritis & G. Kargas & P. Kerkides, 2009. "Simulation of Soil Moisture Profiles Using K(h) from Coupling Experimental Retention Curves and One-Step Outflow Data," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 23(15), pages 3255-3266, December.
    2. Ravindra Kale & Bhabagrahi Sahoo, 2011. "Green-Ampt Infiltration Models for Varied Field Conditions: A Revisit," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 25(14), pages 3505-3536, November.
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    Cited by:

    1. Prashant K. Srivastava, 2017. "Satellite Soil Moisture: Review of Theory and Applications in Water Resources," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 31(10), pages 3161-3176, August.

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