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Deep learning models for groundwater level prediction based on delay penalty 基于延迟惩罚的地下水位预测深度学习模型
Pub Date : 2024-01-19 DOI: 10.2166/ws.2024.009
Chenjia Zhang, Tianxin Xu, Yan Zhang, Daokun Ma
In irrigation agriculture, predicting groundwater level (GWL) using deep learning models can help decision-makers coordinate surface water and groundwater usage, thus aiding in the sustainable development and utilization of groundwater. However, when making a long sequence prediction, prediction sequences often have severe delays affecting the availability of prediction results. In this paper, a new loss function is proposed to minimize the lag and oversmoothing on the prediction of GWLs. GWL, meteorology, and pumping data are collected via an irrigation Internet of Things system in Hutubi County, Xinjiang. Through Pearson's correlation analysis, historical potential evapotranspiration (ET0), groundwater extraction, and GWL were chosen to predict GWLs. Datasets were constructed through the proposed spatiotemporal data fusion method; then, the best model from the six deep learning models was selected by comparing the prediction capability of the datasets. Finally, the mean-squared error (MSE) loss function is replaced by the proposed loss function. Compared to the mean absolute error, MSE, and predicted sequence graphs, the new loss function significantly depresses the time delay with similar prediction accuracy.
在农业灌溉领域,利用深度学习模型预测地下水位(GWL)可以帮助决策者协调地表水和地下水的使用,从而有助于地下水的可持续开发和利用。然而,在进行长序列预测时,预测序列往往会出现严重的延迟,影响预测结果的可用性。本文提出了一种新的损失函数,以尽量减少 GWL 预测的滞后和过平滑。本文通过新疆呼图壁县的灌溉物联网系统收集 GWL、气象和抽水数据。通过皮尔逊相关分析,选择历史潜在蒸散量(ET0)、地下水开采量和 GWL 来预测 GWL。通过提出的时空数据融合方法构建数据集,然后通过比较数据集的预测能力,从六个深度学习模型中选出最佳模型。最后,提出的损失函数取代了均方误差(MSE)损失函数。与平均绝对误差、MSE 和预测序列图相比,新的损失函数在预测精度相似的情况下显著降低了时间延迟。
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引用次数: 0
Assessment of customer satisfaction with the water supply system in low-income countries: a case of Adama City, Ethiopia 低收入国家客户对供水系统满意度的评估:埃塞俄比亚阿达玛市的案例
Pub Date : 2024-01-18 DOI: 10.2166/ws.2024.006
Abelkassim Aminu Beshir, Daniel Reddythota, Esayas Alemayehu
In developing countries like Ethiopia, ensuring the sustainability of water supply systems is a significant challenge. To achieve the sustainable development goal 6 of providing clean water to people worldwide, understanding customer perceptions and satisfaction is crucial. This study conducted questionnaire surveys and interviews with key stakeholders in Adama town to assess customer satisfaction and service quality dimensions. Of 435 participants, 275 (63.22%) were females and 160 (36.78%) were males. The analysis revealed that all dimensions of service quality significantly affected customer satisfaction at a 5% level of significance. Specifically, tangibility, responsiveness, and assurance had a highly significant effect on customer satisfaction (p = 0.001). However, reliability, tangibility, and responsiveness scored below 50% in the overall Customer Satisfaction Index, indicating customer dissatisfaction. On the other hand, assurance and empathy scored above or equal to 50%, suggesting satisfactory levels of customer satisfaction. The study highlighted the importance of addressing Adama's pressure and billing problems to improve the empathy dimension. Enhancing services in these areas would contribute to overall customer satisfaction. The findings of this study are valuable for appropriate municipal service planning and management, facilitating service enhancement and cost recovery efforts.
在埃塞俄比亚等发展中国家,确保供水系统的可持续性是一项重大挑战。为实现可持续发展目标 6,即向全世界人民提供清洁水,了解客户的看法和满意度至关重要。本研究对阿达玛镇的主要利益相关者进行了问卷调查和访谈,以评估客户满意度和服务质量。在 435 名参与者中,275 名(63.22%)为女性,160 名(36.78%)为男性。分析表明,在 5%的显著性水平上,服务质量的所有维度都对顾客满意度有显著影响。具体而言,有形性、响应性和保证性对顾客满意度的影响非常明显(p = 0.001)。然而,可靠性、有形性和响应性在总体客户满意度指数中的得分低于 50%,表明客户不满意。另一方面,保证和同理心的得分高于或等于 50%,表明客户满意度令人满意。该研究强调了解决 Adama 的压力和账单问题以提高同理心维度的重要性。加强这些方面的服务将有助于提高整体客户满意度。这项研究的结果对于适当的市政服务规划和管理、促进服务提升和成本回收工作都很有价值。
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引用次数: 0
Comparison of naphthalene degradation by hydrogen peroxide, nano-calcium peroxide, peroxydisulfate, and peroxymonosulfate in the Fe(II)-citric acid catalytic environments 过氧化氢、纳米过氧化钙、过氧化二硫酸盐和过氧化单硫酸盐在铁(II)-柠檬酸催化环境中降解萘的比较
Pub Date : 2024-01-17 DOI: 10.2166/ws.2024.004
Ruzhuang Zhang, Xingbin Fang, Yulong Liu, Ming Li, Guilu Zeng, Rumin Yang, Yiqin Qiu, Shuguang Lyu
Naphthalene (NAP) was chosen as a target contaminant due to its increasing environmental concern in this work. Using hydrogen peroxide (H2O2), nano-calcium peroxide (nCP), peroxydisulfate (PDS), and peroxymonosulfate (PMS) as oxidants activated by Fe(II)-citric acid (CA) in aqueous solution, 92.8, 95.0, 97.5, and 99.9% of NAP were removed, respectively, in which CA could significantly enhance NAP degradation. HO• was demonstrated to be the major radical responsible for NAP removal in H2O2/Fe(II)/CA and nCP/Fe(II)/CA processes; both HO• and SO4•− were major radicals in PDS/Fe(II)/CA process, whereas SO4•− was the sole dominant radical in PMS/Fe(II)/CA process. The impacts of water matrices (anions, natural organic matters, and surfactants) and initial solution pH on NAP removal as well as the practicalities of these four systems in groundwater were explored. The efficient NAP degradation of nCP/Fe(II)/CA and PMS/Fe(II)/CA processes in the actual groundwater indicated that these two systems have great potential and advantages in the remediation of NAP-contaminated groundwater.
由于萘(NAP)对环境的影响日益严重,本研究选择萘作为目标污染物。以过氧化氢(H2O2)、纳米过氧化钙(nCP)、过氧化二硫酸盐(PDS)和过氧化单硫酸盐(PMS)为氧化剂,经铁(II)-柠檬酸(CA)在水溶液中活化,NAP的去除率分别为92.8%、95.0%、97.5%和99.9%,其中CA能显著增强NAP的降解。在H2O2/Fe(II)/CA和nCP/Fe(II)/CA过程中,HO-是去除NAP的主要自由基;在PDS/Fe(II)/CA过程中,HO-和SO4-都是主要自由基,而在PMS/Fe(II)/CA过程中,SO4-是唯一的主要自由基。研究还探讨了水基质(阴离子、天然有机物和表面活性剂)和初始溶液 pH 对 NAP 去除的影响,以及这四种体系在地下水中的实用性。在实际地下水中,nCP/Fe(II)/CA 和 PMS/Fe(II)/CA 工艺对 NAP 的高效降解表明,这两种工艺在修复受 NAP 污染的地下水方面具有巨大的潜力和优势。
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引用次数: 0
Coupling Monte Carlo simulation with CRITIC-enhanced water quality assessment for the Weishui Reservoir 将蒙特卡洛模拟与 CRITIC 增强型渭水水库水质评估相结合
Pub Date : 2024-01-16 DOI: 10.2166/ws.2024.007
Hui Ye, Libin Chen, K. Zou, Wenqi Wu, Ruming Dan, Yiran Wang
Traditional methods for water quality assessment often overlook the uncertainty of water quality data during the sample collection process, leading to limitations in their application. Therefore, this study combines the comprehensive water quality index (CWQI) method and the improved CWQI method based on CRITIC with the Monte Carlo method to evaluate the water quality in the Weishui Reservoir watershed. The results indicate that (1) there is a noticeable difference in water quality between the Shaxiping and Dayanzui sampling points. The water quality at the Shaxiping sampling point is excellent, with a water quality classification of Class I. In contrast, the water quality at the Dayanzui sampling point is comparatively poorer, with an average water quality classification of Class III. (2) Sensitivity analysis shows that TN, NH4+-N, and TP are more sensitive than other indicators, suggesting that they are the primary factors influencing the evaluation results. (3) Compared to the traditional CWQI method, combining the CRITIC-based improved CWQI method with the Monte Carlo method is more scientifically rigorous. It considers the variety of evaluation indicators, allocates weights rationally, and provides evaluation results that align better with seasonal variations, resulting in higher discriminative power.
传统的水质评价方法往往忽视了水样采集过程中水质数据的不确定性,导致其应用受到限制。因此,本研究将水质综合指数法(CWQI)和基于 CRITIC 的改进 CWQI 法与蒙特卡罗法相结合,对渭水水库流域水质进行了评价。结果表明:(1) 沙溪坪采样点和大岩嘴采样点的水质存在明显差异。沙溪坪采样点的水质为优,水质级别为 I 类;而大岩嘴采样点的水质相对较差,平均水质级别为 III 类。(2) 敏感性分析表明,TN、NH4+-N 和 TP 比其他指标更敏感,表明它们是影响评价结果的主要因素。(3) 与传统的 CWQI 方法相比,基于 CRITIC 的改进 CWQI 方法与 Monte Carlo 方法相结合,更加科学严谨。它考虑了评价指标的多样性,合理分配权重,提供的评价结果更符合季节变化,从而具有更高的判别能力。
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引用次数: 0
A potential solution for clean water supply: multi-effect solar still and water quality analysis 清洁水供应的潜在解决方案:多效太阳能蒸馏器和水质分析
Pub Date : 2024-01-16 DOI: 10.2166/ws.2024.003
Akhlaq Ahmad, Zahid Mahmood Khan, H. Farid
Access to clean and safe drinking water is a significant challenge for individuals residing in suburban and remote regions of Pakistan. This study aimed to design, fabricate, and test a multi-effect solar still with four U-shaped condensing stages as a low-cost solution to this problem. The solar still was evaluated for its efficacy in removing common pollutants found in contaminated water sources. The results revealed an impressive 99% efficacy in eliminating various water pollutants, including conductivity, total hardness, pH, fluoride, and nitrate using the solar still. Water quality tests conducted for conductivity, total hardness, pH, fluoride, and nitrate revealed complete elimination of these parameters in most samples. Microbiological pollutants were also assessed through the presence/absence tests for fecal coliform and Escherichia coli, showing no presence in the distillate. In addition, the solar still effectively removed organic parameters, including alachlor, lindane, and endrin, within acceptable international standards. Thus, the proposed solar still has the potential to serve as an alternate method for producing safe drinking water in areas where access to clean potable water is limited. The findings of this study provide valuable insights for policymakers and researchers interested in addressing water scarcity in remote and suburban areas of Pakistan.
对于居住在巴基斯坦郊区和偏远地区的居民来说,获得清洁安全的饮用水是一项重大挑战。本研究旨在设计、制造和测试一种具有四个 U 形冷凝级的多效太阳能蒸馏器,作为解决这一问题的低成本方案。对太阳能蒸馏器去除受污染水源中常见污染物的功效进行了评估。结果表明,使用太阳能蒸馏器去除各种水污染物(包括电导率、总硬度、pH 值、氟化物和硝酸盐)的效率高达 99%,令人印象深刻。对电导率、总硬度、pH 值、氟化物和硝酸盐进行的水质测试表明,大多数样本中的这些参数都已完全消除。微生物污染物也通过粪大肠菌群和大肠埃希氏菌的存在/不存在测试进行了评估,结果显示蒸馏水中不存在微生物污染物。此外,太阳能蒸馏器还有效地去除了有机参数,包括甲草胺、林丹和异狄氏剂,均在可接受的国际标准范围内。因此,拟议的太阳能蒸馏器有可能成为在清洁饮用水供应有限的地区生产安全饮用水的替代方法。这项研究的结果为有志于解决巴基斯坦偏远和郊区缺水问题的决策者和研究人员提供了宝贵的见解。
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引用次数: 0
Rainwater harvesting and its efficient utilization in mandarin (Citrus reticulata Blanco) orchards under a dry sub-humid tropical climate 亚湿润干旱热带气候下柑橘园的雨水收集及其有效利用
Pub Date : 2024-01-16 DOI: 10.2166/ws.2024.005
Pravukalyan Panigrahi
Water stress is a major factor affecting the productivity of citrus. Conservation and efficient use of rainfall–runoff may be an option for sustainable citriculture in water-scarce regions. A study, therefore, was conducted to evaluate the techno-economic feasibility of rainwater management strategies in citrus orchards of a water-scarce region of central India. The following three management strategies, namely (1) a continuous trench between plant rows (CTPR), (2) CTPR + rain water harvesting tank (RWHT)-based surface irrigation (IS), and (3) CTPR + RWHT-based solar-powered drip irrigation (ISD) were compared with rain-fed treatment (RFT) in citrus. Annually, CTPR + RWHT-based ISD conserved 4,556 m3 water ha−1, and resulted in higher fruit yield (219%), water productivity (85%), net profit (298%), net economic water productivity (130%), sustainable yield index (49%) and energy use efficiency (87%) compared with the RFT (fruit yield, 7.14 t ha−1; water productivity, 1.88 kg m−3; net profit, INR 59,704 ha−1; net economic water productivity, INR 15.75 m−3; sustainable yield index, 0.59; energy use efficiency,1.02 MJt−1) in citrus. The water balance of WHT indicated that 47% of harvested water could be utilized for irrigation in orchards. Overall, efficient rainwater management is suggested for citrus cultivation in water-scarce regions.
水分胁迫是影响柑橘产量的一个主要因素。保护和有效利用降雨径流可能是缺水地区可持续柑橘栽培的一个选择。因此,研究人员对印度中部缺水地区柑橘园雨水管理策略的技术经济可行性进行了评估。研究比较了以下三种柑橘雨水管理策略:(1) 行间连续沟渠(CTPR);(2) CTPR + 基于雨水收集池(RWHT)的地表灌溉(IS);(3) CTPR + 基于雨水收集池(RWHT)的太阳能滴灌(ISD)与雨水灌溉处理(RFT)。与雨水灌溉处理相比,基于 CTPR + RWHT 的太阳能滴灌每年节水 4,556 立方米/公顷-1,提高了果实产量(219%)、水分生产率(85%)、净利润(298%)、净经济水分生产率(130%)、可持续产量指数(49%)和能源利用效率(87%)(果实产量,7.14 吨/公顷-1;水分生产率,1.88 千克/立方米-3;净利润,59,704 印度卢比/公顷-1;净经济水分生产率,15.75 印度卢比/立方米-3;可持续产量指数,0.59;能源利用效率,1.02 兆焦耳/吨-1)。WHT 的水平衡表明,47% 的雨水可用于果园灌溉。总之,建议在缺水地区对柑橘进行高效雨水管理。
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引用次数: 0
Molecular detection of Human Adenovirus and Human Bocavirus in wastewater and drain water in the western Nile Delta of Egypt 埃及尼罗河三角洲西部废水和排水中人类腺病毒和人类博卡病毒的分子检测
Pub Date : 2024-01-11 DOI: 10.2166/ws.2024.001
K. R. Badr, Elmahdy M. Elmahdy, Mohamed Nasr Fathy Shaheen
Human Adenovirus (HAdV) and Human Bocavirus (HBoV) are frequently found in different water sources throughout the year. Due to their health impact on humans, continuous monitoring of these viruses is one of the important tools to evaluate their circulation within the society. This study aimed to investigate the prevalence of HAdV and HBoV in different environmental samples collected from the western Nile Delta of Egypt. A total of 264 samples were collected from treated and untreated sewage samples (48), sewage sludge samples (24), drainage water samples (96), and drainage sediment samples (96) from December 2019 to November 2021. Molecular detection by nested PCR was performed to detect both viruses in the collected samples. The results indicated that HAdV was more prevalent than HBoV in all types of sewage samples, with the highest detection rate in untreated sewage samples. The detection rates of both viruses were relatively lower in sludge sewage samples. In drainage water and sediment samples, HAdV and HBoV were detected with similar frequencies, although the detection rates were generally lower than those observed in sewage samples. The results of this study emphasize the importance of monitoring the presence of these viruses in environmental samples with proper treatment and disposal of sewage to ensure public health and safety.
人腺病毒(HAdV)和人球形病毒(HBoV)常年存在于不同的水源中。由于这些病毒对人类健康的影响,持续监测这些病毒是评估其在社会中传播情况的重要工具之一。本研究旨在调查从埃及尼罗河三角洲西部采集的不同环境样本中 HAdV 和 HBoV 的流行情况。从 2019 年 12 月到 2021 年 11 月,共收集了 264 份样本,包括经过处理和未经处理的污水样本(48 份)、污水污泥样本(24 份)、排水样本(96 份)和排水沉积物样本(96 份)。采用巢式 PCR 进行分子检测,以检测采集样本中的两种病毒。结果表明,在所有类型的污水样本中,HAdV 的流行率均高于 HBoV,而在未经处理的污水样本中,HAdV 的检出率最高。在污泥污水样本中,这两种病毒的检出率相对较低。在排水样本和沉积物样本中,HAdV 和 HBoV 的检出频率相似,但检出率普遍低于污水样本。这项研究的结果表明,在妥善处理和处置污水的同时,监测环境样本中是否存在这些病毒对确保公众健康和安全十分重要。
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Water Supply
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