scholarly journals Sustainable sediment management options for reservoirs: a case study of Chashma Reservoir in Pakistan

2018 ◽  
Vol 8 (4) ◽  
Author(s):  
Mubashar Ali ◽  
Abdul Sattar Shakir
Keyword(s):  
Sediment Management ◽  
Management Options

scholarly journals Watershed management with special emphasis on fresh water wetland: a case study of a flood plain wetland in west Bengal, India

2013 ◽  
Vol 13 (1) ◽  
pp. 1-10
Keyword(s):  
Flood Control ◽  
West Bengal ◽  
Economic Status ◽  
Water Quality Monitoring ◽  
Flood Plain ◽  
Management Options ◽  
Aquatic Productivity ◽  
Control Water ◽  
Wetland Use

The last few decades we have witnessed an enormous rise in awareness of the importance of wetlands. Mathura beel1 has been assumed to take the attention in recent years because of its ecological significance in terms of flood control, water purification, aquatic productivity, and microclimatic regulation etc. The aim of this paper is to present a complete scenario of Mathura beel through different analyses. To materialize the main objective, the water quality monitoring, socioeconomic analyses, and a perception study on wetland use and wetland threat are considered separately. In this study, the objective was extended to observe the complete socio-economic status, and a detailed perceptional study on wetland use, and wetland threat. At the end of the study, detailed management options have been given to protect and to conserve the economy and the ecosystem of Mathura beel.

Sediment management options for the lower Ebro River and its delta

2007 ◽  
Vol 7 (5) ◽  
pp. 285-295 ◽  
Author(s):  
Albert Rovira ◽  
Carles Ibàñez
Keyword(s):  
Sediment Management ◽  
Management Options ◽  
Ebro River

Physical and numerical modelling of sediment guiding walls in an alpine river

2021 ◽  
Author(s):  
Jakob Siedersleben ◽  
Marco Schuster ◽  
Dennis Ties ◽  
Benjamin Zwick ◽  
Markus Aufleger ◽  
...  
Keyword(s):  
Numerical Model ◽  
Numerical Modelling ◽  
Power Plants ◽  
Sediment Management ◽  
Design Flow ◽  
Scale Model ◽  
Surface Measurement ◽  
Management Options ◽  
Erosion And Deposition ◽  
Alpine River

<p>The presented work is part of the optimization of the sediment management at the hydroelectric powerplants in Reutte/Höfen in Austria. The weirs of the two powerplants are situated at the alpine river Lech, located about 3 km upstream of the Lechaschau gauge (A=1012.2 km²). Totally five sluice gates and a fixed overflow weir are controlling the upstream reservoir, being subjected to high rates of coarse bed load material. In frame of a coupled approach of physical and numerical modelling, different options to (i) avoid/minimize sediment deposition and (ii) allow improved sediment flushing were tested and optimized. Besides a lowering of energy losses (reduced spilling times) the reduction of depositions downstream close to the turbine outlet were considered.</p><p>The physical model covers the hydropower and weir system of both power plants within a stretch of 400m / 150m using a model scale of 1:25. Investigated situations covered periods of reservoir sedimentation, flushing of the reservoir and typical flood flow situations (e.g. HQ1 and an unsteady HQ5 event). For model parametrization, sediment samples to quantify size distribution were taken in the field. Sediment inputs to the model were realized dynamically and were required (due to scaling effects) to exclude cohesive fractions having a minimum particle size of 0.5 mm. The full-area surface measurement of the river bed was made by means of airborne laser bathymetry and echo sounding.</p><p>As part of an optimization of the overall sediment management strategy, the focus of the presented research is on the western located runoff power plant Höfen. Via a lateral water intake, a maximum design flow of 15 m³/s is withdrawn causing that the intake structure is subjected to sediment depositions. Within the described scale model (1:25) and a partial scale model (1:15) covering the western side, several management options and configurations of sediment guiding walls were tested. Erosion and deposition as well as the transported material are assessed by 3D laser scanning and permanent monitoring of transported sediment load entering and leaving the scale model.</p><p>Complementary, a 2D hydro numerical model using a layer based multi fraction approach for sediment transport is set up for an extended area to simulate the morpho-dynamic behavior. The numerical model covers the whole weir system and 750 m of the upstream part of the Lech. The simulations made were realized at nature scale and allowed to mimic the erosion and deposition pattern obtained within the physical modelling for different tested options. Regardless of a chosen guiding wall setup, the results showed that each one is compromise between sediment defense and the effectiveness of the subsequent flushing processes.</p>

scholarly journals Assessment of Soil Suitability for Improvement of Soil Factors and Agricultural Management

2019 ◽  
Vol 11 (6) ◽  
pp. 1588 ◽  
Author(s):  
Sameh Abd-Elmabod ◽  
Noura Bakr ◽  
Miriam Muñoz-Rojas ◽  
Paulo Pereira ◽  
Zhenhua Zhang ◽  
...  
Keyword(s):  
Agricultural Practices ◽  
Sustainable Land Use ◽  
Limiting Factors ◽  
Management Scenarios ◽  
Management Options ◽  
Soil Suitability ◽  
Soil Variables ◽  
Soil Systems ◽  
Notable Increase

The dramatic growth of the world’s population is increasing the pressure on natural resources, particularly on soil systems. At the same time, inappropriate agricultural practices are causing widespread soil degradation. Improved management of soil resources and identification of the potential agricultural capability of soils is therefore needed to prevent further land degradation, particularly in dryland areas such as Egypt. Here, we present a case study in the El-Fayoum depression (Northern Egypt) to model and map soil suitability for 12 typical Mediterranean crops. Two management scenarios were analyzed: the current situation (CS) and an optimal scenario (OS) of soil variables. The Almagra model was applied to estimate soil suitability under CS and OS. Management options based on the CS assessment were proposed to reduce some limiting factors: a fixed value of 2 dSm−1 for soil salinity and 5% for sodium saturation; these defined the OS. Under optimal management, the OS scenario showed potential, where a notable increase of the area covered by a high suitability class (around 80%) for annual and semi-annual crops was observed. There was also a marked increase (about 70% for CS and 50% for OS) for perennial crops shifting from the marginal to moderate soil suitability class. The results reveal the importance of proper management to massively alter soil suitability into better states in order to achieve sustainable land use in this fertile agro-ecosystem.

Gulf Regional Sediment Management Master Plan: Case Study Compilation

2012 ◽  
Vol 60 ◽  
pp. 72-124
Author(s):  
Mark R. Byrnes ◽  
Jennifer L. Berlinghoff
Keyword(s):  
Sediment Management ◽  
Master Plan

Hemophilic Arthropathy: Considerations in Management

2001 ◽  
Vol 91 (8) ◽  
pp. 406-414 ◽  
Author(s):  
Thomas J. Chang ◽  
Shenin Mohamed ◽  
Julie Hambleton
Keyword(s):  
Replacement Therapy ◽  
Surgical Management ◽  
Economic Burden ◽  
Disease Process ◽  
Surgical Approaches ◽  
Indications For Surgery ◽  
Management Options ◽  
Hemophilic Arthropathy ◽  
Very High

The authors evaluate nonsurgical and surgical approaches to treating patients with hemophilic arthropathy and review the functional and economic limitations imposed on treating these patients. Indications for surgery are discussed and a case study that incorporates both conservative and surgical management options is presented. While the advent of factor replacement therapy has dramatically changed the course of treatment and prognosis for patients with hemophilia, the authors argue that the economic burden of treating these patients is still very high. The authors recommend that proper conservative and surgical management options for patients with hemophilia should be based upon a thorough understanding of the disease process. (J Am Podiatr Med Assoc 91(8): 406-414, 2001)

Simulations of the influence of clear-cutting on the risk of wind damage on a regional scale over a 20-year period

2006 ◽  
Vol 36 (9) ◽  
pp. 2247-2258 ◽  
Author(s):  
Hongcheng Zeng ◽  
Heli Peltola ◽  
Ari Talkkari ◽  
Harri Strandman ◽  
Ari Venäläinen ◽  
...  
Keyword(s):  
Case Studies ◽  
Regional Scale ◽  
Wind Damage ◽  
Average Risk ◽  
Management Options ◽  
Alternative Management ◽  
Clear Cutting ◽  
Risk Of Wind Damage ◽  
Forest Managers

The aim of this study was to integrate component models for tree growth, wind damage, and airflow to assess the consequences of alternative forest-management options on the long-term risk of wind damage on a regional scale. This work could help forest managers to identify possible vulnerable edges and determine the probability of risk for alternative management plans. This new, integrated system was applied to assessing the risk of wind damage over a 20-year period on three alternative management choices. The risk was compared for the current forest edges without creating new edges (case study I) and situations where new edges were created through different clear-cut options (case studies II and III). Case study II represented more intensive cuttings compared with case study III (over four times more timber was cut). It was found that despite intensive cuttings in case study II, only 15% and 7% fewer vulnerable edges were found on average (risk probability class ≥0.1%) in case studies I and III, respectively. Therefore, forest managers must consider the possible risk of wind damage when harvesting timber.

Sign in / Sign up

Export Citation Format

Share Document