A Daily Water Table Depth Computing Model for Poorly Drained Soils

Devendra Amatya , Marcin Fialkowski , Agnieszka Bitner

Abstract

The objective of this paper is to present a relatively simplified model to predict daily water table (WT) by solving ordinary differential equation dWT (t)/dt = F (α1, α2, α3, WT0(t), RF (t), PET (t)), with α1, α2, α3, WT0 as parameters, and RF (rainfall) and PET (potential evapotranspiration), respectively, as inputs. The model was calibrated and validated with WT on four poorly to moderately drained soils (Lenoir, Rains, Lynchburg, and Goldsboro) on a forested wetland. Calibration results were in good agreement with the measured WT for all soils, except the Goldsboro with deeper WT. r2 (coefficient of determination) and NSE (Nash-Sutcliffe Efficiency) statistics both ranged from 0.81 for the Lenoir to 0.89 and 0.87, respectively, for the Lynchburg. Average absolute daily deviation (AADD) varied from 10.8 cm for Lenoir to 16.7 cm for Rains. The performance was somewhat poorer, during relatively dry periods with deeper WT, yielding r2 and NSE as low as 0.55 and 0.29, respectively, for Lenoir, and large AADD for Lynchburg. Discrepancies were associated with WT overprediction for deeper depths. The new model is capable of describing the WT for poorly drained high water table soils, with a potential for assessing effects of land management, wetland hydrology, and climate changes.
Author Devendra Amatya
Devendra Amatya,,
-
, Marcin Fialkowski
Marcin Fialkowski,,
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, Agnieszka Bitner (FoEEaLS / DoAGCaP)
Agnieszka Bitner,,
- Department of Agricultural Geodesy, Cadastre and Photogrammetry
Journal seriesWetlands, ISSN 0277-5212, e-ISSN 1943-6246, (N/A 70 pkt)
Issue year2019
Vol39
No1
Pages39-54
Publication size in sheets0.75
Keywords in EnglishForested wetlands, Recharge, Evapotranspiration, Soil permeability, Rooting depth, Ordinary differential equations
ASJC Classification2300 General Environmental Science; 2303 Ecology; 2304 Environmental Chemistry
DOIDOI:10.1007/s13157-018-1069-7
URL https://link.springer.com/content/pdf/10.1007%2Fs13157-018-1069-7.pdf
Languageen angielski
Score (nominal)70
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.784; WoS Impact Factor: 2018 = 1.854 (2) - 2018=2.165 (5)
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