scholarly journals Rehabilitation of operation regimes in aged irrigation schemes based on hydraulic simulation

2022 ◽  
Author(s):  
Hasan Bakhoda Bishehgahi ◽  
Atefeh Parvaresh Rizi ◽  
Amir Mohammadi
Keyword(s):  
Water Distribution ◽  
Water Productivity ◽  
Real Data ◽  
Command Area ◽  
Irrigation Season ◽  
Irrigation Scheme ◽  
Hydraulic Simulation ◽  
Water Users ◽  
Level Of Satisfaction ◽  
A Subunit

Abstract The selection and employment of proper methods in water distribution causes increasing in water productivity and the level of satisfaction of water users. It is faced with more difficulties in aged irrigation projects due to temporal changes such as changes in the crop patterns, development of the command area and destruction of canals and hydraulic structures. The plan of operation methods have some hydraulic and social complexities and therefore is usually simplified or implemented experimentally. This research investigates the best options for water distribution to the paddy fields in a subunit of Sefidroud irrigation scheme based on field survey, recording real data and hydraulic simulation with employing SOBEK hydrodynamic model. Different operation scenarios were defined and then simulated in the current physical state of the scheme through replacing the exhausted intake structures with sluice gates. Finally, the better operation scenarios during the irrigation season were suggested based on the distribution indices. The results show that in spite of the current situation, water loss could reach the minimum by employing modification scenarios and indices of adequacy and equity of water distribution improve.

scholarly journals Optimal Allocation of Surface Water Resources at the Provincial Level in the Uzbekistan Region of the Amudarya River Basin

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1446
Author(s):  
Min Wang ◽  
Xi Chen ◽  
Ayetiguli Sidike ◽  
Liangzhong Cao ◽  
Philippe DeMaeyer ◽  
...  
Keyword(s):  
River Basin ◽  
Water Allocation ◽  
Water Distribution ◽  
Optimal Allocation ◽  
Probability Distributions ◽  
Economic Benefits ◽  
Aral Sea ◽  
Incoming Flow ◽  
Provincial Level ◽  
Water Users

Water users in the Amudarya River Basin in Uzbekistan are suffering severe water use competition and uneven water allocation, which seriously threatens ecosystems, as shown, for example, in the well-known Aral Sea catastrophe. This study explores the optimized water allocation schemes in the study area at the provincial level under different incoming flow levels, based on the current water distribution quotas among riparian nations, which are usually ignored in related research. The optimization model of the inexact two-stage stochastic programming method is used, which is characterized by probability distributions and interval values. Results show that (1) water allocation is redistributed among five different sectors. Livestock, industrial, and municipality have the highest water allocation priority, and water competition mainly exists in the other two sectors of irrigation and ecology; (2) water allocation is redistributed among six different provinces, and allocated water only in Bukhara and Khorezm can satisfy the upper bound of water demand; (3) the ecological sector can receive a guaranteed water allocation of 8.237–12.354 km3; (4) under high incoming flow level, compared with the actual water distribution, the total allocated water of four sectors (except for ecology) is reduced by 3.706 km3 and total economic benefits are increased by USD 3.885B.

Using saline reclaimed water on almond grown in Mediterranean conditions: deficit irrigation strategies and salinity effects

2019 ◽  
Vol 19 (5) ◽  
pp. 1413-1421 ◽  
Author(s):  
Gaetano Alessandro Vivaldi ◽  
Salvatore Camposeo ◽  
Giuseppe Lopriore ◽  
Cristina Romero-Trigueros ◽  
Francisco Pedrero Salcedo
Keyword(s):  
Tree Growth ◽  
Deficit Irrigation ◽  
Management Practices ◽  
Water Productivity ◽  
Maximum Yield ◽  
Control Treatment ◽  
Irrigation Season ◽  
Regulated Deficit Irrigation ◽  
Trunk Diameter ◽  
Almond Trees

Abstract The main objective of this study was to acquire agronomic knowledge about the effects of irrigation with saline reclaimed (RW) and desalinated DESERT (DW) water and different irrigation strategies: control full irrigation (FI) and regulated deficit irrigation (RDI) on leaf nutrients, tree growth and fruit quality and yield of almond trees in pots. Our results showed that RW had the highest concentration of some valuable agronomic nutrients such as N, but also of phytotoxic elements (Na and Cl−). Na leaf concentration on RW treatments reached toxic levels, especially under RDI, and toxicity symptoms were shown. Regarding tree growth, cumulate trunk diameter on RW-RDI was significantly lower than on the control treatment and shoot growth was reduced from the beginning of the irrigation season in RW treatments. Maximum yield was reached on RW-FI, 18% higher than the control treatment. However, RDI strategies influenced negatively on yield, being 23% less in RW and 7% less in DW although water productivity was not significantly reduced by water stress. These findings manifest that the combination of RW and RDI can be a promising future practice for almond irrigation, but long-term studies to establish suitable management practices must be developed.

scholarly journals Integrating Participatory Data Acquisition and Modelling of Irrigation Strategies to Enhance Water Productivity in a Small‐Scale Irrigation Scheme in Tigray, Ethiopia

2020 ◽  
Vol 69 (S1) ◽  
pp. 23-37
Author(s):  
Solomon Habtu ◽  
Teklu Erkossa ◽  
Jochen Froebrich ◽  
Filmon Tquabo ◽  
Degol Fissehaye ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Water Productivity ◽  
Small Scale ◽  
Irrigation Scheme ◽  
Small Scale Irrigation

The importance of operating rules and assessments of beneficial use in water resource allocation policy and management

Water Policy ◽  
2009 ◽  
Vol 11 (6) ◽  
pp. 731-741 ◽  
Author(s):  
D. A. Hughes ◽  
S. J. L. Mallory
Keyword(s):  
Water Use ◽  
Water Resource ◽  
Water Allocation ◽  
Real Data ◽  
Allocation Policy ◽  
Beneficial Use ◽  
Water Users ◽  
Operating Rules ◽  
Hypothetical Data ◽  
The Future

The future management of water resources must take into account the levels of beneficial use that apply to various water use sectors. Competition for water during periods of low natural availability (droughts) suggests that users may not have access to their full supply requirement all of the time. This is particularly true of regions such as South Africa where natural water availability is highly variable and possibly will be even more so in the future. Socioeconomic evaluations of water allocation strategies should therefore account for the impacts of periodic restrictions (or shortfalls) in supply across different water use sectors. This paper presents an approach to designing water allocation operating rules that can account for restrictions and their impacts on individual water users, as well as on the community as a whole. The approach is illustrated using hypothetical data, as real data are not generally available. The paper maintains that it is important for socioeconomic evaluation methods to account for the possible effects of supply restrictions as well as the relative benefits of the normal supply volume. If they do not, they will not provide the information required by water resource engineers to design and operate water allocation systems.

scholarly journals Optimal Placement of Pressure Gauges for Water Distribution Networks Using Entropy Theory Based on Pressure Dependent Hydraulic Simulation

Entropy ◽  
2018 ◽  
Vol 20 (8) ◽  
pp. 576 ◽  
Author(s):  
Do Yoo ◽  
Dong Chang ◽  
Yang Song ◽  
Jung Lee
Keyword(s):  
Water Distribution ◽  
Pressure Gauge ◽  
Distribution Networks ◽  
Entropy Method ◽  
Water Distribution Networks ◽  
Optimal Placement ◽  
Hydraulic Simulation ◽  
Priority Order ◽  
The Impact ◽  
Pressure Driven

This study proposed a pressure driven entropy method (PDEM) that determines a priority order of pressure gauge locations, which enables the impact of abnormal condition (e.g., pipe failures) to be quantitatively identified in water distribution networks (WDNs). The method developed utilizes the entropy method from information theory and pressure driven analysis (PDA), which is the latest hydraulic analysis method. The conventional hydraulic approach has problems in determining the locations of pressure gauges, attributable to unrealistic results under abnormal conditions (e.g., negative pressure). The proposed method was applied to two benchmark pipe networks and one real pipe network. The priority order for optimal locations was produced, and the result was compared to existing approach. The results of the conventional method show that the pressure reduction difference of each node became so excessive, which resulted in a distorted distribution. However, with the method developed, which considers the connectivity of a system and the influence among nodes based on PDA and entropy method results, pressure gauges can be more realistically and reasonably located.

scholarly journals Design of Water Distribution System: Appropriateness of Structured System in Large Irrigation Projects in Nepal

2016 ◽  
Vol 19 ◽  
pp. 25-30
Author(s):  
Basistha Adhakari
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Irrigation System ◽  
Command Area ◽  
Irrigation Project ◽  
Irrigation Projects ◽  
Structured System ◽  
Large Irrigation ◽  
Area Development

Many large irrigation projects in Nepal operate under command area development works that emphasize on-farm water distribution and management. These projects have specific design characteristics that were planned to comply with available water resources, climatic conditions, soil type, and water distribution technology. The water distribution technologies differ based on the design needs of each individual project and the design preferences of various foreign consulting firms. This article focuses on the issues of planning and designing water distribution systems of large irrigation systems at the irrigation service delivery level. The layout planning of an irrigation system is an important aspect of design for water distribution, typically guided by hierarchical system. This article also highlights the existing canal hierarchy of these systems and their appropriateness for efficient water distribution. Furthermore, the appropriateness of the structured system is also examined in the Sunsari Morang Irrigation Project. The article concluded with some suggestions for planning and designing command area development works of forthcoming large irrigation projects such as the Sikta Irrigation Project, the Babai Irrigation Project, and the Mahakali Irrigation Project Stage-III.HYDRO Nepal JournalJournal of Water, Energy and EnvironmentIssue: 19Page: 25-30

Irrigation in JULES Land-Only Simulations over South and East Asia

2021 ◽  
Author(s):  
Markus Todt ◽  
Pier Luigi Vidale ◽  
Patrick C. McGuire ◽  
Omar V. Müller
Keyword(s):  
Soil Moisture ◽  
East Asia ◽  
Land Surface ◽  
River Flow ◽  
Heat Fluxes ◽  
Global Climate Models ◽  
Irrigated Agriculture ◽  
Irrigation Season ◽  
Irrigation Scheme ◽  
The Impact

<p>Capturing soil moisture-atmosphere feedbacks in a weather or climate model requires realistic simulation of various land surface processes. However, irrigation and other water management methods are still missing in most global climate models today, despite irrigated agriculture being the dominant land use in parts of Asia. In this study, we test the irrigation scheme available in the land model JULES (Joint UK Land Environment Simulator) by running land-only simulations over South and East Asia driven by WFDEI (WATCH Forcing Data ERA-Interim) forcing data. Irrigation in JULES is applied on a daily basis by replenishing soil moisture in the upper soil layers to field capacity, and we use a version of the irrigation scheme that extracts water for irrigation from groundwater and rivers, which physically limits the amount of irrigation that can be applied. We prescribe irrigation for C3 grasses in order to simulate the effects of agriculture, albeit retaining the simpler, widely used 5-PFT (plant functional type) configuration in JULES. Irrigation generally increases soil moisture and evapotranspiration, which results in increasing latent heat fluxes and decreasing sensible heat fluxes. Comparison with combined observational/machine-learning products for turbulent fluxes shows that while irrigation can reduce biases, other biases in JULES, unrelated to irrigation, are larger than improvements due to the inclusion of irrigation. Irrigation also affects water fluxes within the soil, e.g. runoff and drainage into the groundwater level, as well as soil moisture outside of the irrigation season. We find that the irrigation scheme, at least in the uncoupled land-atmosphere setting, can rapidly deplete groundwater to the point that river flow becomes the main source of irrigation (over the North China Plain and the Indus region) and can have the counterintuitive effect of decreasing annual average soil moisture (over the Ganges plain). Subsequently, we will explore the impact of irrigation on regional climate by conducting coupled land-atmosphere simulations.</p>

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