urban water system
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Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 231
Author(s):  
Seo Hyung Choi ◽  
Bongwoo Shin ◽  
Eunher Shin

When water utilities establish water loss control programs, they traditionally focus on apparent loss rather than real loss when considering economic feasibility in the water sector. There is an urgent need for new management approaches that can address complex relationships and ensure the sustainability of natural resources among different sectors. This study suggests a novel approach for water utilities to manage water losses from the water-energy (WE) Nexus perspective. The Nexus model uses system dynamics to simulate twelve scenarios with the differing status of water loss and energy intensities. This analysis identifies real loss as one of the main causes of resource waste and an essential factor from the Nexus perspective. It also demonstrates that the energy intensity of each process in the urban water system has a significant impact on resource use and transfer. The consumption and movement of resources can be quantified in each process involved in the urban water system to distinguish central and vulnerable processes. This study suggests that the Nexus approach can strongly contribute to quantifying the use and movement of resources between water and energy sectors and the strategic formulation of sustainable and systematic water loss management strategies from the Nexus perspective.


Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 154
Author(s):  
Dionysios Nikolopoulos ◽  
Panagiotis Kossieris ◽  
Ioannis Tsoukalas ◽  
Christos Makropoulos

Optimizing the design and operation of an Urban Water System (UWS) faces significant challenges over its lifespan to account for the uncertainties of important stressors that arise from population growth rates, climate change factors, or shifting demand patterns. The analysis of a UWS’s performance across interdependent subsystems benefits from a multi-model approach where different designs are tested against a variety of metrics and in different times scales for each subsystem. In this work, we present a stress-testing framework for UWSs that assesses the system’s resilience, i.e., the degree to which a UWS continues to perform under progressively increasing disturbance (deviation from normal operating conditions). The framework is underpinned by a modeling chain that covers the entire water cycle, in a source-to-tap manner, coupling a water resources management model, a hydraulic water distribution model, and a water demand generation model. An additional stochastic simulation module enables the representation and modeling of uncertainty throughout the water cycle. We demonstrate the framework by “stress-testing” a synthetic UWS case study with an ensemble of scenarios whose parameters are stochastically changing within the UWS simulation timeframe and quantify the uncertainty in the estimation of the system’s resilience.


2021 ◽  
Author(s):  
Cuimei Lv ◽  
Huali Liao ◽  
Minghua Ling ◽  
Zening Wu ◽  
Denghua Yan

Abstract As one of the large ecological infrastructures, urban water system connectivity project is an important part of urban ecosystem construction. It has a variety of effects, such as conserving biodiversity, enriching urban landscape and increasing land value. It is helpful for the scientific planning and construction of the project to systematically evaluate the effects. However, due to the complex and various effects of urban water system connectivity project, there is no complete effect system and quantitative method. In this paper, the composition and mechanism of positive and negative effects of ecological economics of urban water system connectivity project were deeply analyzed to improve the composition system of eco-economic effects. At the same time, the emergy theory was used to put forward the quantification method of eco-economic effect system. Taking the urban water system connectivity project in Xuchang as an example, it’s ecological, social and economic effects were evaluated. The result showed that the average eco-economic effect of the project is 57.8 million dollars/year. Economic effect and ecological effect are significant, accounting for 88.83% and 9.77% of total effect, respectively. The former is mainly due to land value increment, and the latter is principally owing to biodiversity conservation. It showed that the water system connectivity project in Xuchang can promote the economic development of the surrounding areas and create a good ecological environment, which will bring huge eco-economic effect to the region.


2021 ◽  
Author(s):  
Yijian Xu ◽  
Yanhong Kong

Abstract In recent years, sponge city has been booming in China aiming to alleviate urban flooding and improve water quality of natural water bodies. LID/green infrastructure has been gradually introduced to urban planning and urban water system planning. Efficient deployment of LID facilities is critical, which requires modeling and evaluation to develop rational planning. A case study of Guian New Area was presented to show the application of SWMM and the planning methods in sponge-city-based urban water system planning for water quality sensitive new areas development. Based on SWMM, two river network water quality models, the Dongmenqiao River and the Chetian River, were established through a systematic analysis of the case study area. Baseline scenarios were simulated and analyzed, and assimilation capacities of the two river basins were calculated by a trial-and-error method. Finally, two LID scenarios were carefully designed, simulated, and analyzed to support the planning. The simulations showed that in order to meet the strict water quality requirements in Guian New Area, large scales of LID facilities are required to cut down the rainfall-runoff pollution. Moreover, measures such as more frequent cleaning to reduce pollutants accumulation on the ground should also be taken to mitigate the maximum buildups of pollutants.


2021 ◽  
pp. 118743
Author(s):  
Dingkun Yin ◽  
Te Xu ◽  
Ke Li ◽  
Linyuan Leng ◽  
Haifeng Jia ◽  
...  

Author(s):  
Jonatan Godinez Madrigal ◽  
Nora Van Cauwenbergh ◽  
Jaime Hoogesteger ◽  
Pamela Claure Gutierrez ◽  
Pieter van der Zaag

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