Shota Ootani’s scientific contributions

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Publications (1)


Figure 1. Groundwater basins on the island of Miyakojima.  
Figure 2. Change of LAI after planting of sugarcane. 0 30 60 90 120 150 180 0 1 2 3 4 5 6 7 8  
Table 2 . Measured particle distribution, bulk density, and hydraulic conductivity of all layers.
Table 3 . Combinations of parameters input to HYDRUS-1D.
Figure 5. Relationships of the value of h 50 to RMSE and TET for each Case. (a) Case1; (b) Case 2; (c) Case 3; (d) Case 4.  

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Optimal Choice of Soil Hydraulic Parameters for Simulating the Unsaturated Flow: A Case Study on the Island of Miyakojima, Japan
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October 2015

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8 Citations

Water

Ken Okamoto

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Shota Ootani

We examined the influence of input soil hydraulic parameters on HYDRUS-1D simulations of evapotranspiration and volumetric water contents (VWCs) in the unsaturated zone of a sugarcane field on the island of Miyakojima, Japan. We first optimized the parameters for root water uptake and examined the influence of soil hydraulic parameters (water retention curve and hydraulic conductivity) on simulations of evapotranspiration. We then compared VWCs simulated using measured soil hydraulic parameters with those using pedotransfer estimates obtained with the ROSETTA software package. Our results confirm that it is important to always use soil hydraulic parameters based on measured data, if available, when simulating evapotranspiration and unsaturated water flow processes, rather than pedotransfer functions.

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Citations (1)


... Thus, in this study, the van Genuchten model was selected to determine soil hydraulic properties and water retention variables (θf, θs, α, n, Ks). By inverse modeling, the observed and simulated soil water content was adjusted by the Rosetta pedotransfer function [20,87]. In this sense, the results between observed and simulated data presented very similar variation trends, with values in water content (θ) estimated close to the observed data [82]. ...

Reference:

Water Flow in the Soil Profile Under an Agroforestry System in the Colombian Amazon Based on HYDRUS-1D Model
Optimal Choice of Soil Hydraulic Parameters for Simulating the Unsaturated Flow: A Case Study on the Island of Miyakojima, Japan

Water