Keiji Takase

Effects of temporal resolution on hydrological model parameters and its impact on prediction of river discharge.

Abstract Temporal resolution of rainfall plays an important role in determining the hydrological response of river basins. Rainfall temporal variability can be considered as one of the most critical elements when dealing with input data of rainfall—runoff models. In this paper, a typical lumped rainfall—runoff model is applied to long- and short-term runoff prediction using rainfall data sets with different temporal resolution, including daily, hourly and 10-min interval data, and the dependency of model performance on the time interval of the rainfall data is discussed. Furthermore, the effect of temporal resolution on model parameter values is analysed. As results, rainfall data with shorter temporal resolution provide better performance in short-term river discharge estimation, especially for storm discharge estimation. The most accurate results are obtained on the peak discharge and recession part of the hydrograph by using 10-min interval rainfall data. It is concluded that model parameter values are influenced not only by the temporal resolution of calculation but also by the rainfall intensity—duration relationship. This study provides useful information about determination of hydrological model parameters using data of different temporal resolutions.

Reply to the Discussion of “Effects of temporal resolution on hydrological model parameters and its impact on prediction of river discharge” by Littlewood et al.

Citation Wang, Y., He, B. & Takase, K. (2011) Reply to the Discussion of “Effects of temporal resolution on hydrological model parameters and its impacts on prediction of river discharge” by I. G. Littlewood, B. F. W. Croke & P. C. Young. Hydrol. Sci. J. 56(3), 525–528.

Evaluation of Groundwater Risk due to Anthropogenic Activities in a Coastal Plain of the Seto Inland Sea, Japan

Anthropogenic activities have exerted increasingly large-scale influences on terrestrial ecological systems from the past century, primarily through agriculture; however, the impact of such changes on the groundwater risk is poorly understood. As the main source of water in the Dogo Plain, Japan, groundwater plays an important role in providing people with fresh water and contributing to stream base flow. The purpose of this study is to quantify the alterations in the land use regime as well as to assess the changes in groundwater risk. A conceptual hydrologic model was developed to simulate groundwater and water balance in the study basin under different land use scenarios. The simulated results illustrated different groundwater level evolution and risk in the typical hydrologic years of 2003 (normal flow year), 2001 (high flow year), and 2002 (drought year) in different land use cases that are influenced by anthropogenic activities. The produced groundwater risk simulation results can be used by the local management authorities to enhance sustainable socio-economic planning and environmental management.