Bradley Jenks, Aly-Joy Ulusoy, Filippo Pecci, Ivan Stoianov
{"title":"Distributed Nonconvex Optimization for Control of Water Networks with Time-coupling Constraints.","authors":"Bradley Jenks, Aly-Joy Ulusoy, Filippo Pecci, Ivan Stoianov","doi":"10.1007/s11269-024-03985-8","DOIUrl":"10.1007/s11269-024-03985-8","url":null,"abstract":"<p><p>In this paper, we present a new control model for optimizing pressure and water quality operations in water distribution networks. Our formulation imposes a set of time-coupling constraints to manage temporal pressure variations, which are exacerbated by the transition between pressure and water quality controls. The resulting optimization problem is a nonconvex, nonlinear program with nonseparable structure across time steps. This problem proves challenging for state-of-the-art nonlinear solvers, often precluding their direct use for near real-time control in large-scale networks. To overcome this computational burden, we investigate a distributed optimization approach based on the alternating direction method of multipliers (ADMM). In particular, we implement and evaluate two algorithms: a standard ADMM scheme and a two-level variant that provides theoretical convergence guarantees for our nonconvex problem. We use a benchmarking water network and a large-scale operational network in the UK for our numerical experiments. The results demonstrate good convergence behavior across all problem instances for the two-level algorithm, whereas the standard ADMM approach struggles to converge in some instances. With an appropriately tuned penalty parameter, however, both distributed algorithms yield good quality solutions and computational times compatible with near real-time (e.g. hourly) control requirements for large-scale water networks.</p>","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"39 1","pages":"523-546"},"PeriodicalIF":3.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11801186/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143366094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kristine May F Valmoria, Paolo Nikolai H So, Elizabeth S Montemayor
{"title":"The Time to Negative Conversion among Adult COVID-19 Patients on Chronic Hemodialysis Admitted at the Philippine General Hospital - A Retrospective Cohort Study.","authors":"Kristine May F Valmoria, Paolo Nikolai H So, Elizabeth S Montemayor","doi":"10.47895/amp.vi0.6460","DOIUrl":"10.47895/amp.vi0.6460","url":null,"abstract":"<p><strong>Objectives: </strong>In the Philippines, patients on chronic hemodialysis with COVID-19 remain admitted in hospitals despite clinical recovery because most free-standing dialysis units require proof of negative conversion via Reverse Transcriptase - Polymerase Chain Reaction (RT-PCR). This study aims to determine the time to negative conversion of COVID-19 RT-PCR testing among adult patients on chronic hemodialysis with COVID-19 admitted at the Philippine General Hospital (PGH) and bring insight in using the symptom or time-based procedure as recommended by local guideline, and ultimately, to ensure delivery of adequate hemodialysis despite being infected with COVID-19, shorten isolation period, and conserve resources especially in resource-limited settings.</p><p><strong>Methods: </strong>This is a retrospective cohort study on all adult patients on chronic hemodialysis who were admitted in PGH after the diagnosis of COVID-19 by RT-PCR between March 2020 and February 2021. Descriptive statistics was used in summarizing the data.</p><p><strong>Results: </strong>A total of 90 patients on chronic hemodialysis who tested positive for COVID-19 via RT-PCR admitted at PGH were included in the study. Most of these patients had moderate COVID-19 at 53.3%. The median number of days from onset of symptoms to clinical recovery was 14.5 days. The median time to first negative conversion was 18 days. Most of these patients had negative conversion at the second week. The correlation coefficient between time to clinical recovery and negative conversion was 0.214.</p><p><strong>Conclusion: </strong>Among adult patients on chronic hemodialysis who were admitted in PGH after the diagnosis of COVID-19, the time to negative conversion was longer compared to the time to clinical recovery with a very weak correlation between the two.</p>","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"34 1","pages":"22-27"},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11240000/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70460198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Song-Yue Yang, You-Da Jhong, B. Jhong, Yun-Yang Lin
{"title":"Enhancing Flooding Depth Forecasting Accuracy in an Urban Area Using a Novel Trend Forecasting Method","authors":"Song-Yue Yang, You-Da Jhong, B. Jhong, Yun-Yang Lin","doi":"10.1007/s11269-023-03725-4","DOIUrl":"https://doi.org/10.1007/s11269-023-03725-4","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"6 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139439686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Konstantinou, Carlos Jara-Arriagada, I. Stoianov
{"title":"Investigating the Impact of Cumulative Pressure-Induced Stress on Machine Learning Models for Pipe Breaks","authors":"C. Konstantinou, Carlos Jara-Arriagada, I. Stoianov","doi":"10.1007/s11269-023-03687-7","DOIUrl":"https://doi.org/10.1007/s11269-023-03687-7","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":" 48","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139139359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elmira Valipour, H. Ketabchi, R. S. Shali, Saeed Morid
{"title":"Water Resources Allocation: Iteractions Between Equity/Justice and Allocation Strategies","authors":"Elmira Valipour, H. Ketabchi, R. S. Shali, Saeed Morid","doi":"10.1007/s11269-023-03682-y","DOIUrl":"https://doi.org/10.1007/s11269-023-03682-y","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"11 2‐3","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139147040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Streamflow Data Infilling Using Machine Learning Techniques with Gamma Test","authors":"Saad Dahmani, S. Latif","doi":"10.1007/s11269-023-03694-8","DOIUrl":"https://doi.org/10.1007/s11269-023-03694-8","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"113 6","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139146323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Method For Estimating Excess Rainfall Intensity (ERI) of Combined Sewer Overflow (CSO) Based on Peak Over Threshold (POT) Sampling And The Generalized Pareto Distribution (GPD)","authors":"Xingpo Liu, Wenke Zang, Yuwen Zhou","doi":"10.1007/s11269-023-03708-5","DOIUrl":"https://doi.org/10.1007/s11269-023-03708-5","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"26 5","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139148439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Morani, A. Carravetta, O. Fecarotta, Renato Montillo
{"title":"Detailed Audit of the Energy Efficiency in Water Systems: New Performance Indices","authors":"M. Morani, A. Carravetta, O. Fecarotta, Renato Montillo","doi":"10.1007/s11269-023-03718-3","DOIUrl":"https://doi.org/10.1007/s11269-023-03718-3","url":null,"abstract":"","PeriodicalId":23611,"journal":{"name":"Water Resources Management","volume":"53 s46","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}