scholarly journals Trends in Dam Upgrading in Japan

2018 ◽  
Vol 13 (4) ◽  
pp. 585-594 ◽  
Author(s):  
Takashi Sasaki ◽  
◽  
Masafumi Kondo
Keyword(s):  
Water Level ◽  
Rainy Season ◽  
Weather Conditions ◽  
Water Shortage ◽  
Annual Rainfall ◽  
Water Usage ◽  
Steep Gradient ◽  
Short Period ◽  
The Status ◽  
Typhoon Season

Japan is subjected to harsh weather conditions, with a high overall annual rainfall, a rainy season, and concentrated torrential rains during the typhoon season. Moreover, rivers in Japan generally have a steep gradient and are characteristically subjected to sudden rises of water level that cause flooding, or the falling of water level over a short period when the rain ends, causing the water shortage. Although dams have been constructed according to river basin characteristics to handle flooding and water usage issues, the number of favorable dam sites in Japan is rather small. Thus, extensive dam upgrading, aimed at strengthening the function of existing dams, has recently been carried out. In this report, examples of past dam upgrading projects as well as the status of dam upgrading are reviewed. In particular, the technological issues of dam heightening and additional installation of discharge facilities are discussed for upgrading projects in which structural retrofitting is carried out while the dam is in operation. Moreover, the required measures are considered.

scholarly journals Landscaping with native plants in the UAE: A review

2017 ◽  
pp. 729 ◽  
Author(s):  
Hasnain Alam ◽  
Jabar Zaman Khan Khattak ◽  
Shaijal Babu Thru Ppoyil ◽  
Shyam S. Kurup ◽  
Taoufik Saleh Ksiksi
Keyword(s):  
Exotic Species ◽  
United Arab Emirates ◽  
Native Plants ◽  
Weather Conditions ◽  
High Water ◽  
Water Shortage ◽  
Water Usage ◽  
Water Shortages ◽  
Unique Experience ◽  
Added Benefit

The United Arab Emirates (UAE) has a unique experience in greening the desert. Huge efforts have been done to create green spaces across the country including afforestation and urban landscaping. Most of the landscaping designs were inspired from western landscapes comprises mostly of exotic species, which do not reconcile with the environmental conditions of the UAE. The intensive use of exotic species in artificial vegetation, high water requirements for the UAE greenery, coupled with water shortages and salinity, are causing major environmental and ecological challenges.  Fortunately, the UAE hosts a unique flora and fauna that show remarkable adjustment to harsh weather conditions. Here we emphasize the use of native plants due to their potential to develop landscapes in saline and water shortage conditions, leading to reduced water usage for landscaping. The preservation of native biodiversity of the UAE will be an added benefit. In this article the main aspects of the UAE landscaping efforts, with the associated water resources using native plants in landscaping, problems in promoting native plants in landscaping and possible solutions are discussed.

scholarly journals Solar Powered Smart Irrigation System with GSM for Agriculture

2021 ◽  
Vol 9 (VI) ◽  
pp. 643-648
Author(s):  
Niketan B. Dandhare
Keyword(s):  
Water Level ◽  
Agricultural Sector ◽  
Irrigation System ◽  
Weather Conditions ◽  
Text Messages ◽  
Annual Rainfall ◽  
Level Control ◽  
Moisture Condition ◽  
Soil Moisture Condition ◽  
Level Sensor

Most of the Indian people are dependent on agriculture and for this reason our country’s economy is mainly dependent on agriculture, so efficient agriculture requires proper irrigation and can improve our country’s economy accordingly. We can achieve this with the help of various electronic devices and through its use we can get proper irrigation in this field in an automated manner. Project Irrigation and Water Level Control using AT89S52 designed to address agricultural sector issues related to irrigation and water monitoring systems with available water resources. Prolonged periods of dry weather conditions due to fluctuations in annual rainfall can significantly reduce agricultural yields. Profiteering companies need an efficient irrigation system as their intolerance to the cost and drought of establishing these crops. On this project we're the usage of AT89s52 (8051 microcontroller), humidity sensor, dc water pump, relay driving force, level sensor, gsm modem, sun panel, battery etc. A sprinkler turns on / off depending on soil moisture condition and condition. The motor can be displayed in text messages via the GSM model on a 16X2 LCD. Also, the water level can be monitored by level sensors. It helps to know the availability of water at the input source

scholarly journals Assessing Impact of Climate Change on Hydrology of Melka Kuntrie Subbasin, Ethiopia with Ar4 and Ar5 Projections

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1308 ◽  
Author(s):  
Yitea Seneshaw Getahun ◽  
Ming-Hsu Li ◽  
Pei-Yuan Chen
Keyword(s):  
Climate Change ◽  
Rainy Season ◽  
Hydrological Model ◽  
Water Shortage ◽  
Annual Rainfall ◽  
Water Harvesting ◽  
Rainfed Agriculture ◽  
Resources Management ◽  
Future Challenges ◽  
Impacts Of Climate Change

Assessing future challenges in water resources management is crucial to the Melka Kuntrie (MK) subbasin suffering water shortage. Impact assessments are evaluated by the HBV hydrological model with six scenarios, including two GCMs of AR4-A2 and two GCMs of AR5-RCP4.5 and RCP8.5, for the time periods 2021–2050 and 2071–2100. Evapotranspiration is expected to increase under all scenarios—due to rising temperature—and induce more water stress on rainfed agriculture of the area. However, the increase in the monthly minimum temperature is beneficial to crops against chilling damages. Five out of six projections show significant increases of rainfall and streamflow in both annual and major rainy seasons, except ECHAM-A2. Annual rainfall (streamflow) is expected to increase by 38% (23%) and 57% (49%) during 2021–2050 and 2071–2100, respectively, under RCP8.5 scenarios. Greater flashflood risk is a concern because of the projected increase in streamflow. The projection of decreased streamflow with ECHAM-A2 will exacerbate the existing water shortage, especially in the minor rainy season. Water harvesting during the major rainy season would be vital to enhance water management capacities and reduce flashflood risks. Lacking sufficient hydraulic and irrigation infrastructures, the MK subbasin will be more vulnerable to the impacts of climate change.

PENDUGAAN EROSI DAN NERACA AIR EMBUNG DI WILAYAH PERBATASAN KABUPATEN BELU NUSA TENGGARA TIMUR

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Wahyu Widiyono
Keyword(s):  
Water Balance ◽  
Water Resource ◽  
Water Depth ◽  
Rainy Season ◽  
Water Reservoir ◽  
Water Shortage ◽  
Regional Government ◽  
Environment Management ◽  
Individual Number ◽  
Rainfall Volume

Embung as a man made water reservoir is one of methods to overcome the water shortage in the border area, Belu District, East Nusa Tenggara Province. A number of 27 embungs were built by Regional Government in this area. Embung water and environment management is the main problem to sustain water resource. The research to inventory and identify of vegetation, to predict erosion, to monitor water balance, and to optimize water utilization were conducted, in 2005-2008. The research was undertaken in Embung Leosama. Methods were survey, observation, monitoring and analysis. Results were: (1). There were 7 species and 90 individual number of tree; (2). Prediction of erosion was 97.383 ton/ha/year; (3). Water depth as indicator of embung water balance was decrease due to a little rainfall volume in rainy season 2006/2007; but it was increase in 2007/2008; (4). Embung water can be optimized for drinking cattle, horticulture, nursery and regreening irrigation.Key Words: embung, erosion, water balance.

scholarly journals Spatial distribution of water level impact to back-barrier bays

2018 ◽  
Author(s):  
Alfredo L. Aretxabaleta ◽  
Neil K. Ganju ◽  
Zafer Defne ◽  
Richard P. Signell
Keyword(s):  
Water Level ◽  
Sea Level ◽  
Water Levels ◽  
Analytical Models ◽  
Barnegat Bay ◽  
Sea Level Fluctuations ◽  
Flooding Hazard ◽  
Short Period ◽  
Inlet Geometry ◽  
Spatial Estimates

Abstract. Water level in semi-enclosed bays, landward of barrier islands, is mainly driven by offshore sea level fluctuations that are modulated by bay geometry and bathymetry, causing spatial variability in the ensuing response (transfer). Local wind setup can have a secondary role that depends on wind speed, fetch, and relative orientation of the wind direction and the bay. Inlet geometry and bathymetry primarily regulate the magnitude of the transfer between open ocean and bay. Tides and short-period offshore oscillations are more damped in the bays than longer-lasting offshore fluctuations, such as storm surge and sea level rise. We compare observed and modeled water levels at stations in a mid-Atlantic bay (Barnegat Bay) with offshore water level proxies. Observed water levels in Barnegat Bay are compared and combined with model results from the Coupled Ocean–Atmosphere–Wave–Sediment Transport (COAWST) modeling system to evaluate the spatial structure of the water level transfer. Analytical models based on the dimensional characteristics of the bay are used to combine the observed data and the numerical model results in a physically consistent approach. Model water level transfers match observed values at locations inside the Bay in the storm frequency band (transfers ranging from 70–100 %) and tidal frequencies (10–55 %). The contribution of frequency-dependent local setup caused by wind acting along the bay is also considered. The approach provides transfer estimates for locations inside the Bay where observations were not available resulting in a complete spatial characterization. The approach allows for the study of the Bay response to alternative forcing scenarios (landscape changes, future storms, and rising sea level). Detailed spatial estimates of water level transfer can inform decisions on inlet management and contribute to the assessment of current and future flooding hazard in back-barrier bays and along mainland shorelines.

scholarly journals Rain Erosion Maps for Wind Turbines Based on Geographical Locations: A Case Study in Ireland and Britain

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
K. Pugh ◽  
M. M. Stack
Keyword(s):  
Wind Turbine ◽  
Western Europe ◽  
Meteorological Data ◽  
Turbine Blades ◽  
Weather Conditions ◽  
Annual Rainfall ◽  
Wind Turbine Blades ◽  
Weather Patterns ◽  
The Uk

AbstractErosion rates of wind turbine blades are not constant, and they depend on many external factors including meteorological differences relating to global weather patterns. In order to track the degradation of the turbine blades, it is important to analyse the distribution and change in weather conditions across the country. This case study addresses rainfall in Western Europe using the UK and Ireland data to create a relationship between the erosion rate of wind turbine blades and rainfall for both countries. In order to match the appropriate erosion data to the meteorological data, 2 months of the annual rainfall were chosen, and the differences were analysed. The month of highest rain, January and month of least rain, May were selected for the study. The two variables were then combined with other data including hailstorm events and locations of wind turbine farms to create a general overview of erosion with relation to wind turbine blades.

scholarly journals The lunar and solar diurnal variations of water-level in a well at Kew observatory, Richmond

1918 ◽  
Vol 94 (663) ◽  
pp. 476-478
Keyword(s):  
Water Level ◽  
Royal Society ◽  
Correlation Coefficients ◽  
Barometric Pressure ◽  
Diurnal Variations ◽  
Range Of Movement ◽  
Nearest Point ◽  
Similar Relation ◽  
Short Period ◽  
The Mean

In a paper communicated to the Royal Meteorological Society, it was shown that the experimental well at Kew Observatory responded to the lunar fortnightly oscillation of mean level in the River Thames, which is 300 yards from the Observatory at its nearest point. The sensitiveness of the water-level to barometric pressure has also been investigated, and the results have been given in a paper recently read before the Royal Society. The present paper deals with the effects of the short-period tides in the solar and lunar series, S 1 , S 2 , S 3 , S 4 , and M 1 , M 2 , M 3 , M 4 . Two-hourly measurements, both in lunar and solar time, were made on the traces obtained during the first two years, August, 1914-August, 1916, omitting days of very irregular movement. Monthly mean inequalities were then computed. Well marked solar and lunar diurnal variations were found in each month, taking the form of double oscillations with two maxima and two minima during the 24 hours. The range of movement was in each case found to be highly associated with the mean height of the water in the well, the correlation coefficients being 0·89 (lunar) and 0·90 (solar). A similar relation had been previously found to exist in the case of barometric pressure.

scholarly journals Prototyping of Flooding Early Warning System using Internet of Things Technology and Social Media

2018 ◽  
Vol 197 ◽  
pp. 16003
Author(s):  
Aris Haris Rismayana ◽  
Castaka Agus Sugianto ◽  
Ida Bagus Budiyanto
Keyword(s):  
Social Media ◽  
Internet Of Things ◽  
Water Level ◽  
Water Distribution ◽  
Warning System ◽  
Integrated System ◽  
Water Levels ◽  
Prototype System ◽  
The Status ◽  
Internet Of Things Technology

When the rainy season arrives, flooding is a common phenomenon. Almost every street, housing, village, river, even in the city center, wherever floods can occur. One effort to prevent the flooding is to create a floodgate on reservoirs or dams that are used to control the water distribution. The water level at this dam must be checked frequently to anticipate if the water level is at a dangerous level. The inspection of water levels will be very difficult if it must be conducted by humans who must be available in the field at any time. This research aims to create a prototype system that can replace the human role in monitoring the dam water level condition at any time by developing an integrated system between hardware and software using IoT (Internet of Things) technology approach and social media (twitter and telegram). The developed system consists of the height sensor (distance), microcontroller and wifi module, which is placed on the water gate. This system serves to measure the water level at any time and send data in real time to the server. The results of system testing performed shows that when the system is in normal circumstances, the system sends data to the server every minute, and updates the status of water level in twitter every 5 minutes. In case the water level has exceeded a predetermined limit, the system sends data to the server every 5 seconds and passes the warning message to all registered telegram contacts.

scholarly journals The Variation of Riverbed Material due to Tropical Storms in Shi-Wen River, Taiwan

2014 ◽  
Vol 2014 ◽  
pp. 1-12
Author(s):  
Chin-Ping Lin ◽  
Yu-Min Wang ◽  
Samkele S. Tfwala ◽  
Ching-Nuo Chen
Keyword(s):  
Grain Size ◽  
Geometric Mean ◽  
Size Variation ◽  
Annual Rainfall ◽  
Geometric Standard Deviation ◽  
Roughness Coefficient ◽  
Bed Form ◽  
Subsurface Material ◽  
Typhoon Season ◽  
Bed Material

Taiwan, because of its location, is a flood prone region and is characterised by typhoons which brings about two-thirds to three quarters of the annual rainfall amount. Consequently, enormous flows result in rivers and entrain some fractions of the grains that constitute the riverbed. Hence, the purpose of the study is to quantify the impacts of these enormous flows on the distribution of grain size in riverbeds. The characteristics of riverbed material prior to and after the typhoon season are compared in Shi-Wen River located at southern Taiwan. These include grain size variation, bimodality, and roughness coefficient. A decrease (65%) and increase (50%) in geometric mean size of grains were observed for subsurface and surface bed material, respectively. Geometric standard deviation decreased in all sites after typhoon. Subsurface material was bimodal prior to typhoons and polymodal after. For surface material, modal class is in the gravel class, while after typhoons it shifts towards cobble class. The reduction in geometric mean resulted to a decrease in roughness coefficient by up to 30%. Finally, the relationship of Shields and Froude numbers are studied and a change in the bed form to antidunes and transition form is observed, respectively.

Temporal partitioning of reproductive activity in a neotropical anuran community

2004 ◽  
Vol 20 (3) ◽  
pp. 271-280 ◽  
Author(s):  
Brigitte Gottsberger ◽  
Edith Gruber
Keyword(s):  
Water Level ◽  
Rainy Season ◽  
Abiotic Factors ◽  
Reproductive Mode ◽  
Reproductive Activity ◽  
Active Species ◽  
South American ◽  
Wet Season ◽  
Breeding Sites ◽  
Calling Activity

The phenology of calling activity and reproduction of a neotropical anuran community in French Guiana was studied during one rainy season. We investigated the correlation between calling activity, rainfall, temperature and water level in two ponds and recorded the occurrence of tadpoles of pond-breeding species. The study site contained 31 calling frog species, which were divided into groups according to reproductive mode. Increased rainfall was associated with increased reproductive activity in all groups, but temporal patterns in calling activity varied significantly between groups. Species with aquatic oviposition exhibited sporadic acoustic activity, aggregating into explosive breeding events following heavy rainfall. Species laying eggs in foam nests had the peak of calling activity at the start of the rainy season. Taxa with embryonic development on vegetation called mainly from middle to late wet season, being the only group which showed a significant correlation of calling with increasing water level. Dendrobatids with terrestrial oviposition and subsequent parental tadpole transportation were continuously active. Species with direct development or with non-feeding larvae were mainly active at the beginning of the rainy season. It is concluded that phenologies of calling activity in South American tropical anuran species are strongly influenced by abiotic factors like rainfall and availability of breeding sites. The temporal limitation of the rainy season forces species to adjust calling and reproductive activity according to their reproductive modes.

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