Journal of Korea Water Resources Association最新文献_第4页

Estimating time-varying parameters for monthly water balance model using particle filter: assimilation of stream flow data 用粒子滤波估计月水平衡模型的时变参数:径流数据的同化

Journal of Korea Water Resources Association Pub Date : 2021-06-01 DOI: 10.3741/JKWRA.2021.54.6.365

Jeonghyeon Choi

引用次数: 0

Two-dimensional numerical experiment considering cohort size and wood jam characteristic on driftwood 考虑队列大小和浮木堵塞特性的二维数值实验

Journal of Korea Water Resources Association Pub Date : 2021-06-01 DOI: 10.3741/JKWRA.2021.54.6.407

T. Kang

引用次数: 0

Improved method of the conventional flow duration curve by using daily mode discharges 利用日模流量对常规流量持续时间曲线进行了改进

Journal of Korea Water Resources Association Pub Date : 2021-06-01 DOI: 10.3741/JKWRA.2021.54.6.355

Taejin Park

引用次数: 1

Calculation of future rainfall scenarios to consider the impact of climate change in Seoul City’s hydraulic facility design standards 计算未来降雨情景，考虑气候变化对首尔市水利设施的影响，制定设计标准

Journal of Korea Water Resources Association Pub Date : 2021-06-01 DOI: 10.3741/JKWRA.2021.54.6.419

Sun-Kwon Yoon

引用次数: 0

Establishment of flood forecasting and warning system in the un-gauged small and medium watershed through ODA 通过官方发展援助在未计量的中小流域建立洪水预报预警系统

Journal of Korea Water Resources Association Pub Date : 2021-06-01 DOI: 10.3741/JKWRA.2021.54.6.381

D. Koh

引用次数: 1

Estimation of reflectivity-rainfall relationship parameters and uncertainty assessment for high resolution rainfall information 高分辨率降雨信息反射率-降雨关系参数估算及不确定性评估

Journal of Korea Water Resources Association Pub Date : 2021-05-01 DOI: 10.3741/JKWRA.2021.54.5.321

Tae-Jeong Kim

{"title":"Estimation of reflectivity-rainfall relationship parameters and uncertainty assessment for high resolution rainfall information","authors":"Tae-Jeong Kim","doi":"10.3741/JKWRA.2021.54.5.321","DOIUrl":"https://doi.org/10.3741/JKWRA.2021.54.5.321","url":null,"abstract":"A fixed reflectivity-rainfall relationship approach, such as the Marshall-Palmer relationship, for an entire year and different seasons, can be problematic in cases where the relationship varies spatially and temporally throughout a region. From this perspective, this study explores the use of long-term radar reflectivity for South Korea to obtain a nationwide calibrated Z-R relationship and the associated uncertainties within a Bayesian inference framework. A calibrated spatially structured pattern in the parameters exists, particularly for the wet season and parameter for the dry season. A pronounced region of high values during the wet and dry seasons may be partially associated with storm movements in that season. Overall, the radar rainfall fields based on the proposed modeling procedure are similar to the observed rainfall fields. In contrast, the radar rainfall fields obtained from the existing Marshall-Palmer relationship show a systematic underestimation. In the event of high impact weather, it is expected that the value of national radar resources can be improved by establishing an active watershed-level hydrological analysis system.","PeriodicalId":224359,"journal":{"name":"Journal of Korea Water Resources Association","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114882499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radar rainfall prediction based on deep learning considering temporal consistency 考虑时间一致性的基于深度学习的雷达降雨预测

Journal of Korea Water Resources Association Pub Date : 2021-05-01 DOI: 10.3741/JKWRA.2021.54.5.301

Hongjoon Shin

{"title":"Radar rainfall prediction based on deep learning considering temporal consistency","authors":"Hongjoon Shin","doi":"10.3741/JKWRA.2021.54.5.301","DOIUrl":"https://doi.org/10.3741/JKWRA.2021.54.5.301","url":null,"abstract":"In this study, we tried to improve the performance of the existing U-net-based deep learning rainfall prediction model, which can weaken the meaning of time series order. For this, ConvLSTM2D U-Net structure model considering temporal consistency of data was applied, and we evaluated accuracy of the ConvLSTM2D U-Net model using a RainNet model and an extrapolation-based advection model. In addition, we tried to improve the uncertainty in the model training process by performing learning not only with a single model but also with 10 ensemble models. The trained neural network rainfall prediction model was optimized to generate 10-minute advance prediction data using four consecutive data of the past 30 minutes from the present. The results of deep learning rainfall prediction models are difficult to identify schematically distinct differences, but with ConvLSTM2D U-Net, the magnitude of the prediction error is the smallest and the location of rainfall is relatively accurate. In particular, the ensemble ConvLSTM2D U-Net showed high CSI, low MAE, and a narrow error range, and predicted rainfall more accurately and stable prediction performance than other models. However, the prediction performance for a specific point was very low compared to the prediction performance for the entire area, and the deep learning rainfall prediction model also had limitations. Through this study, it was confirmed that the ConvLSTM2D U-Net neural network structure to account for the change of time could increase the prediction accuracy, but there is still a limitation of the convolution deep neural network model due to spatial smoothing in the strong rainfall region or detailed rainfall prediction.","PeriodicalId":224359,"journal":{"name":"Journal of Korea Water Resources Association","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129343469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A study on estimation of agricultural water usage in river consider hydrological condition 考虑水文条件的河流农业用水量估算方法研究

Journal of Korea Water Resources Association Pub Date : 2021-05-01 DOI: 10.3741/JKWRA.2021.54.5.311

Jaewon Kwak

{"title":"A study on estimation of agricultural water usage in river consider hydrological condition","authors":"Jaewon Kwak","doi":"10.3741/JKWRA.2021.54.5.311","DOIUrl":"https://doi.org/10.3741/JKWRA.2021.54.5.311","url":null,"abstract":"The agricultural water, which occupy about 61% of total water usage in the South Korea, is significantly objective to archieve effecitive water resources management. The objective of the study is to suggest a simple method in actual practice that could be used to estimate agricultural water usage in river considering hydrological condition. Historical record of agricultural water usage and runoff, which take account for hydrological condition of the basin, were obtained for totally 27 river basins. As the result, the high threshold value of the agricultural water usage rates compared to maximum usage amount has a particular correlations to the percent of normal year runoff for last 2 month, and threshold line of agricultural water usage rates was derived using the quantile regressions. Finally, two dimensionless threshold line and empirical formulas that described the correlation between the percent of normal year runoff for last 2 month and the agricultural water usage rate compared to maximum usage amount were derived. Also, the simple criteria to select which line and formula based on the characteristics of the basins was suggested but it need further studies. The result of the study could be used as an elemantary data in actual practice for water resoureces management.","PeriodicalId":224359,"journal":{"name":"Journal of Korea Water Resources Association","volume":"24 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134412788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Comparison of the flow estimation methods through GIUH rainfall-runoff model for flood warning system on Banseong stream 基于GIUH降雨径流模型的盘城河洪水预警系统流量估算方法比较

Journal of Korea Water Resources Association Pub Date : 2021-05-01 DOI: 10.3741/JKWRA.2021.54.5.347

Kiyoung Seong

{"title":"Comparison of the flow estimation methods through GIUH rainfall-runoff model for flood warning system on Banseong stream","authors":"Kiyoung Seong","doi":"10.3741/JKWRA.2021.54.5.347","DOIUrl":"https://doi.org/10.3741/JKWRA.2021.54.5.347","url":null,"abstract":"In the past few years, various damages have occurred in the vicinity of rivers due to flooding. In order to alleviate such flood damage, structural and non-structural measures are being established, and one of the important non-structural measures is to establish a flood warning system. In general, in order to establish a flood warning system, the water level of the flood alarm reference point is set, the critical flow corresponding thereto is calculated, and the warning precipitation amount corresponding to the critical flow is calculated through the Geomorphological Instantaneous Unit Hydrograph (GIUH) rainfall-runoff model. In particular, when calculating the critical flow, various studies have calculated the critical flow through the Manning formula. To compare the adequacy of this, in this study, the critical flow was calculated through the HEC-RAS model and compared with the value obtained from Manning’s equation. As a result of the comparison, it was confirmed that the critical flow calculated by the Manning equation adopted excessive alarm precipitation values and lead a very high flow compared to the existing design precipitation. In contrast, the critical flow of HEC-RAS presented an appropriate alarm precipitation value and was found to be appropriate to the annual average alarm standard. From the results of this study, it seems more appropriate to calculate the critical flow through HEC-RAS, rather than through the existing Manning equation, in a situation where various river projects have been conducted resulting that most of the rivers have been surveyed.","PeriodicalId":224359,"journal":{"name":"Journal of Korea Water Resources Association","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129647759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of bifurcation characteristics for the Seolmacheon experimental catchment based on variable scale of source basin 基于变尺度源盆地的西马川实验流域分岔特征分析

Journal of Korea Water Resources Association Pub Date : 2021-05-01 DOI: 10.3741/JKWRA.2021.54.5.289

Joo-Cheol Kim

{"title":"Analysis of bifurcation characteristics for the Seolmacheon experimental catchment based on variable scale of source basin","authors":"Joo-Cheol Kim","doi":"10.3741/JKWRA.2021.54.5.289","DOIUrl":"https://doi.org/10.3741/JKWRA.2021.54.5.289","url":null,"abstract":"This study analyzes bifurcation characteristics of the Seolmacheon experimental catchment by extracting the shape variation of channel network due to variable scale of source basin or threshold area. As the area of source basin decreases, a bifurcation process of channel network occurs within the basin of interest, resulting in the elongation of channel network (increase of total channel length) as well as the expansion of channel network (increase of the source number). In the former case, the elongation of channel reaches overwhelms the generation of sources, whereas, in the latter case, the drainage path network tends to fulfill the inner space of the basin of interest reflecting the opposite trend. Therefore, scale invariance of natural channel network could be expressed to be a balanced geomorphologic feature between the elongation of channel network and the expansion of channel network due to decrease of source basin scale. The bifurcation structure of the Seolmacheon experimental catchment can be characterized by the coexistence of the elongation and scale invariance of channel network, and thus a further study is required to find out which factor is more crucial to rainfall transformation into runoff.","PeriodicalId":224359,"journal":{"name":"Journal of Korea Water Resources Association","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130080249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1