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

Water

Ken Okamoto¹  Kazuhito Sakai²  Shinya Nakamura²  Hiroyuki Cho³  Tamotsu Nakandakari²  Shota Ootani⁴ 

[1] United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-0065, Japan; E-Mail:;Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan; E-Mails:;Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan; E-Mail:;Eight-Japan Engineering Consultants Inc.; 33-11 Honcho 5 Chome, Nakano-ku, Tokyo 164-0012, Japan; E-Mail:

关键词: HYDRUS-1D;    ROSETTA;    retention curve;    hydraulic conductivity;    sugarcane field;    the island of Miyakojima;   

DOI  :  10.3390/w7105676

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.