Analysis of Flood Control Effects of Heightening of Agricultural Reservoir Dam

As the management areas for NPS pollution continue to increase, it is essential to conduct a situation analysis considering the regional characteristics and the scope of pollution reduction. In this study, the focus is on differentiating regional (urban, agricultural) characteristics to enhance water quality and reduce pollution loads in the increasing management areas for NPSs. Furthermore, priority management areas are identified based on urgency and vulnerability, and management strategies are proposed. The assessment involved evaluating both streamflow and water quality (T-P) using long-term monitoring data and watershed models (SWAT and HSPF) that take into account regional characteristics. The results indicated notable regional improvements, with T-P pollution reductions ranging from 20.7% to 26.8% and T-P concentration reductions ranging from 16.4% to 24.7% compared to baseline conditions in unmanaged areas. Based on these research findings, it is anticipated that the efficient and effective management of NPS pollution can be implemented on a regional basis. Moreover, the results of this study will not only contribute to the establishment of pollution standards, but also significantly impact the evaluation and proposal of management objectives, thereby making a substantial contribution to national water quality policies.

Section: Approach For Selecting Areas For Nps Pollution Managementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analyzing Priority Management for Water Quality Improvement Strategies with Regional Characteristics

Lee,

Park,

Choi

et al. 2024

“…In general flood control of dam, the inflow (I) is stored up through an appropriate level, and a stored water is discharged (O) in consideration of the downstream river conditions. Since the dam storage and discharge do not occur at the same time and there is a lag time between both events, the flood control capability of the dam has been analyzed based on how much the peak flood water level can be reduced downstream via the dam operation [22][23][24][25][26][27][28].…”

Section: The Ratio Of Storage Volume To Flood Inflow (Rsf) For Flood ...mentioning

confidence: 99%

Development of Simple Method for Flood Control Capacity Estimation of Dam in South Korea

Han

Kwak

Kim

et al. 2022

As flood damage is becoming more frequent and severe worldwide, efficient flood control of dams has been highlighted. The purpose of the study is to establish a simple method for dam operators to estimate the flood control capacity and predischarge level required for flood response. The cumulative probability distribution (CDF) pair with the same return period for 12 major dams located in South Korea were estimated using the frequency matching method. A Ratio of Storage volume to Flood inflow (RSF) concept was suggested and applied for each dam, and they were classified into three types: Linear, Estranged, and Vague according to the water storage characteristics. Using the method presented in this study, we suggested the required amount of flood control capacity and target water level for each dam. The results demonstrated that there is no linear relationship between flood and storage of dam when the ratio of watershed area to a storage capacity of the dam is 2.0 or more, or the ratio of watershed area to flood control capacity is 20.0 or more. Further, it was found that the RSF value is affected by the initial water level of the dam when a high flood inflow was observed for Estranged and Vague types. It is expected that the method presented in this study can be basic information for performing predischarge for flood control in numerous dams.

“…Most current dams have been constructed without considering future increases in rainfall due to climate change [4]. Rehabilitation of old hydraulic structures has been steadily required as extreme rainfall increases and land use changes due to climate change and anthropization [5][6][7]. There are many future climate change scenarios of global circulation models (GCMs) and representative concentration pathways (RCPs) [8].…”

Section: Introductionmentioning

confidence: 99%

Flood Vulnerability Assessment for Prioritizing and Evaluating Rehabilitation of Ungauged Reservoirs Considering Climate Change

Jun

Kang

Hwang

et al. 2020

The objective of this research was to apply the flood vulnerability assessment to ungauged reservoirs for prioritizing and evaluating the reservoir rehabilitation according to climate change. The flood vulnerability index (FVI) can quantitatively compare the flood vulnerabilities of the analysis targets and can be used for the relative comparison of hydraulic structures to determine the reinforcement priority. In this study, we proposed a simple FVI that contained exposure and adaptive capacity of the hydraulic structure. We selected ten dam heightening reservoirs in Korea and constructed data for flood vulnerability assessment. The FVI was calculated before and after the dam heightening to analyze the priority and effect of reservoir rehabilitation under climate change. Flood vulnerability indices were estimated for four periods (1995s: 1981–2010, 2025s: 2011–2040, 2055s: 2041–2070, 2085s: 2071–2100) and before/after the dam heightening project. As a result, flood vulnerability indices decreased after the dam heightening project for all reservoirs, and the indices have increasing tendencies in the future. The indices developed in this study can be useful to determine the priority and to evaluate the effect of rehabilitation for hydraulic structures.