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Water 2015, 7(10), 5676-5688; doi:10.3390/w7105676

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

1
United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-0065, Japan
2
Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
3
Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
4
Eight-Japan Engineering Consultants Inc.; 33-11 Honcho 5 Chome, Nakano-ku, Tokyo 164-0012, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Athanasios Loukas
Received: 18 August 2015 / Revised: 6 October 2015 / Accepted: 13 October 2015 / Published: 20 October 2015
(This article belongs to the Special Issue Water Resource Variability and Climate Change)
View Full-Text   |   Download PDF [433 KB, uploaded 20 October 2015]   |  

Abstract

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. View Full-Text
Keywords: HYDRUS-1D; ROSETTA; retention curve; hydraulic conductivity; sugarcane field; the island of Miyakojima HYDRUS-1D; ROSETTA; retention curve; hydraulic conductivity; sugarcane field; the island of Miyakojima
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Okamoto, K.; Sakai, K.; Nakamura, S.; Cho, H.; Nakandakari, T.; Ootani, S. Optimal Choice of Soil Hydraulic Parameters for Simulating the Unsaturated Flow: A Case Study on the Island of Miyakojima, Japan. Water 2015, 7, 5676-5688.

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