This study conducted a broad review of the pre-and post-processor methods for ensemble streamflow prediction using a Korean case study. Categorical forecasts offered by the Korea Meteorogical Administration and deterministic forecasts of a regional climate model called Seoul National University Regional Climate Model(SNURCM) were selected as climate forecast information for the pre-processors and incorporated into Ensemble Streamflow Prediction(ESP) runs with the TANK hydrologic model. The post-processors were then used to minimize a possible error propagated through the streamflow generation. The application results show that use of the post-processor more effectively reduced the uncertainty of the no-processor ESP than use of the pre-processor, especially in dry season.

The scale of damage caused by drought is on the rise in South Korea. The country has been experiencing a 4–6-year cycle of extreme droughts at a nationwide scale. From 2014–2015, South Korea suffered from its worst drought in the past 50 years. This study aims to provide an effective drought management policy by analyzing the Korean government's response to the 2014–2015 drought under the National Drought Management Framework, which is composed of four stages: prevention, preparedness, response, and recovery. The findings indicate that the Korean government effectively addressed the drought, yet there are no measures currently in place to cope with megadroughts that last for more than 5 consecutive years. Immediate attention is required to conduct research and introduce policies that will help in managing megadroughts. This paper takes an interdisciplinary approach to drought preparedness research in the context of megadroughts and proposes an efficient national drought management framework that involves engagement of relevant line ministries.

Impacts of climate change are being observed in the globe as well as the Korean peninsula. In the past 100 years, the average temperature of the earth rose about 0.75 degree in celsius, while that of Korean peninsula rose about 1.5 degree in celsius. The fifth Assessment Report of IPCC(Intergovermental Panel on Climate Change) predicts that the water pollution will be aggravated by change of hydrologic extremes such as floods and droughts and increase of water temperature (KMA and MOLIT, 2009). In this study, future runoff was calculated by applying climate change scenario to analyze the future water quality for each targe period (

No abstract

Virtual water is defined as the volume of water to produce commodities and provide services, which has been developed by Tony Allan since the early 1990s. This research aims to evaluate a volume of virtual water trade in Korea from 1998 to 2007 by applying the evaluation method of unit virtual water volume to agricultural, live stock and industrial products, which is developed by Chapagain and Hoekstra (2004). Also, the concept of water footprint is deployed to quantify the volume of virtual water trade between countries. The study attempts to assess the appropriateness of the evaluation method of unit virtual water volume by employing the method to calculate the total amount of agricultural products in Korea and comparing this with the amount of agricultural water demand in the Korea Water Vision 2006. The research outcome shows that Korea has a net virtual water import of 32 billion m 3 on average in the form of agricultural, live stock and industrial commodities whose volume gradually increases. The gap between the volume of virtual water import of agricultural and live stock commodities and the total volume of agricultural water use reaches approximately 600 million m 3 . This figure can be negligible considering the total volume of water demand in Korea, around 16 billion m 3 , which demonstrates the validity of the evaluation method in terms of analyzing water balance.