scholarly journals Improvement in the Sediment Management of a Lagoon Harbor: The Case of Marano Lagunare, Italy

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3074
Author(s):  
Silvia Bosa ◽  
Marco Petti ◽  
Sara Pascolo
Keyword(s):  
Sediment Quality ◽  
Coupled Model ◽  
Natural Process ◽  
Sediment Deposition ◽  
Water Current ◽  
Or Efficiency ◽  
Safe Navigation ◽  
Surrounding Environment ◽  
Sediment Input ◽  
Secondary Port

Port silting is a common and natural process which often causes serious inconveniences for safe navigation and requires expensive dredging operations to keep the port operative. Sediment deposition is closely related to the exchange water between the basin and the surrounding environment; one way to limit deposits is by reducing the flow entering the port. However, this may be in contrast with the need for adequate sediment quality, which in turn is closely related to an appropriate water current. This seems to be particularly important in lagoon environments, where sediments are often polluted, making its disposal more complicated and costly. The present paper investigates the situation of the port of Marano Lagunare (Italy) by means of a bidimensional morphological-hydrodynamic and spectral coupled model. To reduce the sediment input into the port, the closure of a secondary port entrance is usually suggested. However, this work demonstrates that a complete dredging of the secondary port inlet allows for an increase in water circulation or efficiency renewal, which ensures a better oxygenation at the bottom of the canals.

scholarly journals Impacts of Sand and Gravel Quarrying on the Stream Channel and Surrounding Environment

2017 ◽  
Vol 4 (1) ◽  
pp. 7-12
Author(s):  
Maharabam Anjali Devi ◽  
Lunghim Rongmei
Keyword(s):  
Remote Sensing ◽  
Remote Sensing And Gis ◽  
River Channel ◽  
Natural Process ◽  
Sediment Supply ◽  
River Morphology ◽  
Stream Channel ◽  
Gravel Mining ◽  
Surrounding Environment ◽  
Sand And Gravel

The longtime sustainability of river channel in the natural process depends on the gradient, volume of water, sediment supply and deposition in the river. Naturally, rivers maintain balance of river channel in all stage of the cycle of erosion. However, human activity mainly sand and gravel mining frequently disturb the balance that has much impact on the river morphology. The Imphal River between Motbung to Awang Leikinthabi is one of the worse sand and gravel-querying regions in Manipur. Hence, the main aim of this paper is to assess the impacts of querying on riverine landform and surrounding environment by using Remote Sensing and GIS.

Climate reanalysis data with global coverage enable sediment load prediction in the absence of systematic field data

2021 ◽  
Author(s):  
Kilian Mouris ◽  
Sebastian Schwindt ◽  
Stefan Haun ◽  
Maria Herminia Pesci ◽  
Kristian Förster ◽  
...  
Keyword(s):  
Catchment Area ◽  
Sediment Load ◽  
Coupled Model ◽  
River Network ◽  
Transport Processes ◽  
Data Availability ◽  
Monitoring Station ◽  
Load Prediction ◽  
Sediment Loads ◽  
Sediment Input

<p>Hydro-morphodynamic models are increasingly popular for predicting sedimentation processes in reservoirs. To leverage the accuracy of such models, their boundary conditions have to be defined as precise as possible. While hydrological models provide efficient routines to establish inflow hydrographs at the model boundaries, the determination of the sediment input is challenging and involves large uncertainties. This study identifies prominent parameters that influence the sediment input into a reservoir, and therefore, expected sedimentation rates. For this purpose, erosion and transport processes in the catchment area of the Banja Reservoir (Albania) are analyzed.</p><p>The Banja Reservoir is located on the Devoll River in the Southeast of Albania and has a storage capacity of 400 Million m³. The catchment area has a size of 2,900 km² and lies in a mountainous region. The climate is characterized by dry and hot summers and humid winters. There are significant differences in precipitation patterns in the catchment due to topographical conditions and with increasing distance from the coast in the West of the reservoir. Because snowfall is frequent in winter, the runoff regime of the Devoll River and its tributaries is driven by precipitation and snowmelt.</p><p>To calculate the sediment input at the inflow boundaries of the reservoir, a comprehensive analysis in combination with hydrological modelling of the catchment is indispensable. This study applies the Revised Universal Soil Loss Equation (RUSLE) model coupled with the SEdiment Delivery Distributed (SEDD) model, as an integrated approach that bridges interdisciplinary expertise in geomorphology and hydrology. Since measured precipitation data neither fulfils minimum requirements in terms of spatio-temporal resolution nor in terms of time series length, the ERA5 reanalysis dataset is used as input data. The coupled model is calibrated with suspended sediment data measured at a monitoring station upstream of the reservoir over a 2–years period. The model enables to approximate the monthly or annual sediment load for any point in the river network. Thus, the sediment load into the reservoir can be assessed for every major tributary, even in areas with limited data availability. In addition, a high spatial resolution (25 m x 25 m) of the model enables the identification of areas that cause particularly high sediment loads.</p><p>The optimized coupled model predicts sediment loads that are in good agreement with sediment loads measured at the monitoring station (Nash-Sutcliffe efficiency: NSE<sub>annual</sub> = 0.96; NSE<sub>monthly</sub> = 0.81). Consequently, climate reanalysis datasets are a viable alternative in regions with data scarcity. Furthermore, the spatial representation of the results suggests that the sediment load into the reservoir mainly originates from steep and sparsely vegetated or agricultural areas close to the river network. Intensive rainfall additionally fosters erosion, which is why erosion rates are higher in the Western part of the catchment area.</p>

scholarly journals The role of Lake Dongting in regulating the sediment budget of the Yangtze River

2005 ◽  
Vol 9 (6) ◽  
pp. 692-698 ◽  
Author(s):  
Shi-bao Dai ◽  
Shi-lun Yang ◽  
Jun Zhu ◽  
Ang Gao ◽  
Peng Li
Keyword(s):  
Sediment Deposition ◽  
Sediment Flux ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
The Holocene ◽  
The Three Gorges ◽  
Sediment Input ◽  
Lower Yangtze ◽  
Total Sediment ◽  
The Three Gorges Dam

Abstract. Lake Dongting, the second largest freshwater lake in China and located in the middle reaches of the River Yangtze catchment, was formed at the beginning of the Holocene period by sea level rise and has varied in size with changes in local weather patterns. The sedimentation rate in Lake Dongting during the Holocene is about 50×106 m3 yr-1, or 80×106 t yr-1 (a sand bulk density of 1.6×103 kg m-3), given the sediment deposition rate as 10 mm yr-1 and the average lake size as 5000 km2. By comparing the sediment import and export, it is estimated that the sediment deposition rate of Lake Dongting was 110.6×106 t yr-1 from 1956 to 2003. Siltation and raised embankments reduced the size of the lake and its capacity to accommodate floods. The sediment delivery ratio (SDR) of the middle and lower Yangtze is about 0.92 (total sediment output divided by total sediment input) given that the total sediment supply into the middle and lower Yangtze is 455.1×106 t yr-1 and the total sediment discharge into the sea is 419×106 t yr-1. Therefore, if it were not for Lake Dongting, the sediment flux at Datong would be 73.6×106 t yr-1 (80×106 t yr-1×0.92) more, an increase of 27% during the Holocene and an increase of 26% to 101.75×106 t yr-1 from 1956 to 2003. Historically, Lake Dongting had a considerable influence in regulating the sediment budget of the Yangtze. However, afforestation and the construction of large dams, such as the Three Gorges Dam, reduced significantly the sediment deposition in Lake Dongting. In 2003, the completion of the Three Gorges Dam and the subsequent impoundment of water reduced the sediment input from the Yangtze and net deposition in Lake Dongting dropped to 25% and 18% of the mean values of the historic records (1956-2003). During the same period, the amount of sediment deposited in Lake Dongting was only 10% of the sediment discharge at Datong. The influence of the sediment deposited in Lake Dongting on the sediment flux to the sea from the Yangtze has fallen since the completion of the Three Gorges Dam and will be further reduced in future. The evolution of the relationship between Lake Dongting and the Yangtze is a compound result of human impacts coupled with natural self-adjusting processes in the river system.

scholarly journals STUDY ON APPLICATION OF WASP MODEL FOR SIMULATING WATER QUALITY OF DAU TIENG RESERVOIR

2009 ◽  
Vol 12 (2) ◽  
pp. 5-16
Author(s):  
Ha Thi Van Nguyen ◽  
Quynh Vu Nhu Tran ◽  
Satoshi Takizawa
Keyword(s):  
Water Quality ◽  
Input Data ◽  
Natural Process ◽  
Quality Analysis ◽  
Water Quality Analysis ◽  
Surrounding Environment ◽  
Water Stratification ◽  
To Receive ◽  
Model Water

Based on some measurementS conducted at different timeS and different locations, the environmental managers need the model to imitate the natural process ocurred in the surrounding environment at different times. They are the tools to receive signs about possible existing status of environment which affected by human activities. This paper will present the summary of the preleminary application of the WASP model (Water Quality Analysis Simulation Program) developed by the USEPA to simulate water quality of Dau Tieng Reservoir. The results showed that the WASP model could be used for imitating and predicting water quality of reservoirs. However, in order to improve its application capacity and the precise of the model results, the input data, especially, water stratification and flow are important factors needed to be improved.

PROSPEK USAHA INOVASI SPEAKER DAN PAJANGAN UNIK UPAYA PEMANFAATAN LIMBAH GULUNGAN KERTAS

2019 ◽  
Vol 2 (2) ◽  
pp. 171
Author(s):  
Saputri Rizki Ramadhanti ◽  
Joti Dina Kartikasari ◽  
Alfian Muttoqim Muttoqim ◽  
Umi Farida Farida ◽  
Amanda Oktaviani Amanda
Keyword(s):  
College Students ◽  
Social Media ◽  
Economic Value ◽  
Waste Paper ◽  
Direct Selling ◽  
Paper Waste ◽  
Entrepreneurial Spirit ◽  
Surrounding Environment ◽  
Business Opportunities ◽  
New Business

The amount of paper waste, especially paper waste of yarn rolls in the socks manufactured factory and the convection industry that has not been used to get high economic value is an opportunity to open a new business, especially in the electronic and art craft product. SEPIK PANIK (Speaker of Music and Unique Display of Waste Paper Rolls) is an innovation from processing paper waste to be a unique speaker. The purposes of this program are: 1) Utilizing paper waste to get high selling value. 2) Creating handmade products from paper waste into speakers as well as unique creative display. 3) To accommodate the desire of college students who have entrepreneurial spirit and artistic creations to open new business opportunities. The method of make this SEPIK PANIK product includes 1) Making paper tube of speaker and 2) Making a Unique Display. The Sales of this product have been carried out during May to August 2019, products that have been sold are 34 units, obtained a profit of Rp. 1.170,000. Sales and promotion methods are carried out both online through social media and offline, namely direct selling and consignment. Based on these results, this business is very profitable and can benefit the surrounding environment.

Kegiatan pembelajaran sebagai upaya dalam menstimulus perkembangan sosial-emosional anak usia dini

2020 ◽  
Vol 3 (1) ◽  
pp. 43-57
Author(s):  
Aghnaita Aghnaita ◽  
Ajeng Almira Salsabila ◽  
Camelia Hanik ◽  
Maulida Syafitri ◽  
Norhayani Norhayani ◽  
...  
Keyword(s):  
Early Childhood ◽  
Social Development ◽  
Emotional Development ◽  
Learning Activities ◽  
Primary Data ◽  
Social Emotional ◽  
Cultural Backgrounds ◽  
Childhood Education ◽  
Surrounding Environment ◽  
Stimulation Of

This study aims to determine the emotional social development of early childhood in Integrated Early Childhood Education Tarbiyatul Athfal UIN Antasari Banjarmasin as well as the form of learning activities undertaken as an effort to stimulate the emotional social development. The research method used is qualitative research on 6 children and learning activities that can stimulate children's emotional emotional development as primary data. Based on research conducted, the results obtained that the child's emotional social development tends to be unstable. Children often prefer to play alone. Nevertheless, children also begin to show interest in hanging out in the surrounding environment and doing play activities together. In addition, there are several factors influence, such as: social emotional experiences of children, gender differences, differences in family and cultural backgrounds, and parenting. While the form of learning activities that are pursued in the form of stimulation of children's emotional social development include: routine activities of reading Asmaul Husna and short surahs, filling in journals, playing indoor, and conducting learning activities. The activity was carried out through exemplary methods, sharing learning, and collaborative games.

PENGEMBANGAN BAHAN AJAR TEKS DRAMA BERDASARKAN PENGALAMAN PENGARANG

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Didin Khaerudin ◽  
Suherli Kusmana ◽  
Iyay Robia Khaerudin
Keyword(s):  
Personal Experience ◽  
Teaching Materials ◽  
Learning Skills ◽  
Student Activities ◽  
Development Method ◽  
Average Value ◽  
Surrounding Environment ◽  
Basic Competencies ◽  
Materials Used ◽  
Minimum Criteria

Research conducted to develop drama text teaching materials based on the experience of the author of the drama script aims to make it easier for students to understand drama text material. In addition, based on the author's experience students are expected to emulate the author's creative process in writing a paper. The research method used in this research is the research and development method. Based on the results of the interview it can be concluded that the ability to write drama is determined based on mastery of the elements of drama and the ability to develop stories based on the author's experience. The process of writing drama is done in several steps: (1) searching for ideas based on personal experience, other people, or the surrounding environment; (2) processing ideas to find plots (characters), characters or characters that vary with their inner conflicts, settings and dialogues, interesting conflicts, and messages to be conveyed; (3) starts the process of writing drama with stages and elements of drama; (4) revision of drama products. Teaching material developed is presented from basic competencies of knowledge and basic competencies of learning skills. Based on experiments on developed teaching materials it is known that the average value of the ability to write plays gets a score exceeding the minimum criteria, so that the teaching materials used are effective. Based on observations it is known that teaching materials can help students in learning and student activities become more independent, and active.

Water current turbines for Sudan: Using the energy in the Nile

Waterlines ◽  
1991 ◽  
Vol 9 (3) ◽  
pp. 30-32
Author(s):  
Barbara Sexon ◽  
Peter Garman
Keyword(s):  
Water Current

Spatiotemporal Changes of Riverbed and Surrounding Environment in Yongding River (Beijing section) in the Past 40 Years

2020 ◽  
Vol 64 (4) ◽  
pp. 40407-1-40407-13 ◽  
Author(s):  
Ran Pang ◽  
He Huang ◽  
Tri Dev Acharya
Keyword(s):  
Economic Development ◽  
Water Conservation ◽  
Human Activities ◽  
Urban Areas ◽  
Water Volume ◽  
Cropland Area ◽  
The Past ◽  
Surrounding Environment ◽  
Spatiotemporal Changes ◽  
Yongding River

Abstract Yongding River is one of the five major river systems in Beijing. It is located to the west of Beijing. It has influenced culture along its basin. The river supports both rural and urban areas. Furthermore, it influences economic development, water conservation, and the natural environment. However, during the past few decades, due to the combined effect of increasing population and economic activities, a series of changes have led to problems such as the reduction in water volume and the exposure of the riverbed. In this study, remote sensing images were used to derive land cover maps and compare spatiotemporal changes during the past 40 years. As a result, the following data were found: forest changed least; cropland area increased to a large extent; bareland area was reduced by a maximum of 63%; surface water area in the study area was lower from 1989 to 1999 because of the excessive use of water in human activities, but it increased by 92% from 2010 to 2018 as awareness about protecting the environment arose; there was a small increase in the built-up area, but this was more planned. These results reveal that water conservancy construction, agroforestry activities, and increasing urbanization have a great impact on the surrounding environment of the Yongding River (Beijing section). This study discusses in detail how the current situation can be attributed to of human activities, policies, economic development, and ecological conservation Furthermore, it suggests improvement by strengthening the governance of the riverbed and the riverside. These results and discussion can be a reference and provide decision support for the management of southwest Beijing or similar river basins in peri-urban areas.

Sign in / Sign up

Export Citation Format

Share Document