MORPHOLOGICAL CHANGES OF THE RIVER MOUTH SAND BAR AT THE KUMANO RIVER

2021 ◽  
Vol 77 (2) ◽  
pp. I_523-I_528
Author(s):  
Junya YAMAMOTO ◽  
Makoto NAKAMICHI ◽  
Masaaki HASHIMOTO ◽  
Jun KANETO ◽  
Tomokazu HIROSAWA ◽  
...  
Keyword(s):  
Morphological Changes ◽  
River Mouth ◽  
Sand Bar

scholarly journals Morphological Changes of the Lower Ping and Chao Phraya Rivers, North and Central Thailand: Flood and Coastal Equilibrium Analyses

2019 ◽  
Vol 11 (1) ◽  
pp. 152-171 ◽  
Author(s):  
Nikhom Chaiwongsaen ◽  
Parisa Nimnate ◽  
Montri Choowong
Keyword(s):  
Morphological Changes ◽  
River Mouth ◽  
Sediment Supply ◽  
Gulf Of Thailand ◽  
River Bank ◽  
Water Storage Capacity ◽  
Rainfall Condition ◽  
Sand Bar ◽  
Geomorphological Changes ◽  
Chao Phraya River

Abstract The Chao Phraya River flows in the largest river basin of Thailand and represents one of the important agricultural and industrial areas in Southeast Asia. The Ping River is one major upstream branch flowing down slope southwardly, joining the Chao Phraya River in the low-lying central plain and ending its course at the Gulf of Thailand. Surprisingly, the overflow occurs frequently and rapidly at the Lower Ping River where channel slope is high, and in particular area, sand-choked is extensively observed, even in normal rainfall condition. In contrary, at the downstream part, the erosion of river bank and shoreline around the mouth of Chao Phraya River has been spatially increasing in place where there should be a massive sediment supply to form a delta. Here we use Landsat imageries taken in 1987, 1997, 2007 and 2017 to analyze geomorphological changes of rivers. Results show that both rivers have undergone the rapid decreasing of water storage capacity and increasing of sand bar areas in river embayment. The total emerged sand bar area in the Lower Ping River increases from 1987 to 2017 up to 28.8 km2. The excessive trapped bed sediments deposition along the upper reaches is responsible for the shallower of river embankment leading to rapid overflow during flooding. At the Chao Phraya River mouth, a total of 18.8 km2 of the coastal area has been eroded from 1987 to 2017.This is caused by the reducing of sediment supply leading to non-equilibrium in the deltaic zone of the upper Gulf of Thailand. There are several possibility implications from this study involving construction of weir, in-channel sand mining, reservoir sedimentation and coastal erosion management.

scholarly journals FIELD AND NUMERICAL STUDIES FOR FROMATION OF SAND BAR AT THE YURA RIVER MOUTH

2015 ◽  
Vol 71 (4) ◽  
pp. I_709-I_714
Author(s):  
Fuminori NAKAMURA ◽  
Misato ASAKURA ◽  
Keiichi KANDA ◽  
Hiroshi MIWA ◽  
Tokuzou HOSOYAMADA
Keyword(s):  
River Mouth ◽  
Numerical Studies ◽  
Sand Bar

FIELD INVESTIGATION FOR SAND BAR AT THE TENJIN RIVER-MOUTH AND REFORMATION OF IT AFTER TYPHOON EVENT

2018 ◽  
Vol 74 (2) ◽  
pp. I_793-I_798
Author(s):  
Masamitsu KUROIWA ◽  
Yuki KAJIKAWA ◽  
Shun TODA ◽  
Hitoshi KURASIGE ◽  
Takashi KATAYAMA
Keyword(s):  
River Mouth ◽  
Field Investigation ◽  
Sand Bar ◽  
Typhoon Event

scholarly journals STUDY ON MECHANISM OF SAND BAR DECLINE AND INTRUSION AT THE NARUSE RIVER MOUTH

2005 ◽  
Vol 49 ◽  
pp. 1339-1344
Author(s):  
Ikuo KAWAMURA ◽  
Hitoshi TANAKA
Keyword(s):  
River Mouth ◽  
Sand Bar

scholarly journals Investigation of Morphological Changes in the Tamsui River Estuary Using an Integrated Coastal and Estuarine Processes Model

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1084 ◽  
Author(s):  
Tung-Chou Hsieh ◽  
Yan Ding ◽  
Keh-Chia Yeh ◽  
Ren-Kai Jhong
Keyword(s):  
Sandy Beach ◽  
Morphological Changes ◽  
River Estuary ◽  
River Mouth ◽  
Physical Processes ◽  
Complex Flow ◽  
Monsoon Period ◽  
Estuarine Processes ◽  
Sediment Flushing ◽  
The Impact

This study is to investigate morphological changes in the Tamsui River Estuary in Taiwan driven by multiple physical processes, such as river flows, tides, waves, and storm surges, and then to study the impacts of sediment flushing operated at the Shihmen reservoir upstream on the river estuary. An integrated coastal and estuarine processes model (CCHE2D-Coast) (Center for Computational Hydroscience and Engineering Two-Dimensional-Coast) was validated by simulating these physical processes in the estuary driven by three historical typhoons in 2008. The site-specifically validated model was then applied to simulate morphological changes in the estuary in response to reservoir sediment flush scenarios from the upstream. For the impact assessment of sediment flushing, a synthetic hydrological event was designed by including a historical typhoon and a typical monsoon. It was found that during the typhoon, the sediments will be mostly deposited in the estuarine river reach of Tamsui and the Wazihwei sandy beach. During the monsoon period, most of the sediments tend to be deposited in the second fishing port of Tamsui, the northern breakwater, and the estuary, while the Wazihwei sandy beach in the river mouth would be scoured by backflow. Simulations of the complex flow fields and morphological changes will facilitate the best practice of sediment management in the coastal and estuarine regions.

scholarly journals APPLICABILITY OF 3D BEACH EVOLUTION MODEL WITH WAVE-CURRENT INTERACTION FOR SAND BAR FORMATION IN A RIVER MOUTH

2016 ◽  
Vol 72 (2) ◽  
pp. I_697-I_702
Author(s):  
Masamitsu KUROIWA ◽  
Ryohei ANAN ◽  
Yoko SHIBUTANI ◽  
Hajime MASE ◽  
Yuhei MATSUBARA
Keyword(s):  
River Mouth ◽  
Evolution Model ◽  
Current Interaction ◽  
Sand Bar ◽  
Bar Formation

scholarly journals Relative Sea-Level Rise Scenario for 2100 along the Coast of South Eastern Sicily (Italy) by InSAR Data, Satellite Images and High-Resolution Topography

2021 ◽  
Vol 13 (6) ◽  
pp. 1108
Author(s):  
Marco Anzidei ◽  
Giovanni Scicchitano ◽  
Giovanni Scardino ◽  
Christian Bignami ◽  
Cristiano Tolomei ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
Salt Marshes ◽  
Satellite Images ◽  
Morphological Changes ◽  
River Mouth ◽  
South Eastern ◽  
Rcp 8.5 ◽  
Coastal Retreat

The global sea-level rise (SLR) projections for the next few decades are the basis for developing flooding maps that depict the expected hazard scenarios. However, the spatially variable land subsidence has generally not been considered in the current projections. In this study, we use geodetic data from global navigation satellite system (GNSS), synthetic aperture radar interferometric measurements (InSAR) and sea-level data from tidal stations to show the combined effects of land subsidence and SLR along the coast between Catania and Marzamemi, in south-eastern Sicily (southern Italy). This is one of the most active tectonic areas of the Mediterranean basin, which drives accelerated SLR, continuous coastal retreat and increasing effects of flooding and storms surges. We focus on six selected areas, which show valuable coastal infrastructures and natural reserves where the expected SLR in the next few years could be a potential cause of significant land flooding and morphological changes of the coastal strip. Through a multidisciplinary study, the multi-temporal flooding scenarios until 2100, have been estimated. Results are based on the spatially variable rates of vertical land movements (VLM), the topographic features of the area provided by airborne Light Detection And Ranging (LiDAR) data and the Intergovernmental Panel on Climate Change (IPCC) projections of SLR in the Representative Concentration Pathways RCP 2.6 and RCP 8.5 emission scenarios. In addition, from the analysis of the time series of optical satellite images, a coastal retreat up to 70 m has been observed at the Ciane river mouth (Siracusa) in the time span 2001–2019. Our results show a diffuse land subsidence locally exceeding 10 ± 2.5 mm/year in some areas, due to compacting artificial landfill, salt marshes and Holocene soft deposits. Given ongoing land subsidence, a high end of RSLR in the RCP 8.5 at 0.52 ± 0.05 m and 1.52 ± 0.13 m is expected for 2050 AD and 2100 AD, respectively, with an exposed area of about 9.7 km2 that will be vulnerable to inundation in the next 80 years.

scholarly journals Response of salinity intrusion to the hydrodynamic conditions and river mouth morphological changes induced by the 2011 tsunami

2020 ◽  
Vol 14 (2) ◽  
pp. 1-16
Author(s):  
Nguyen Xuan Tinh ◽  
Jin Wang ◽  
Hitoshi Tanaka ◽  
Kinuko Ito
Keyword(s):  
Morphological Changes ◽  
Salt Water ◽  
Water Discharge ◽  
River Mouth ◽  
River Channel ◽  
Salt Transport ◽  
Ground Subsidence ◽  
Fishing Ground ◽  
Estuarine System ◽  
Salinity Intrusion

The 2011 Tohoku Earthquake and tsunami were one of the most devastating natural disasters in history. It caused significant ground subsidence and erosion along the Japan coastline. The Natori river mouth which is a habitat for both fishes and bivalves, as an important fishing ground, has been damaged by the tsunami because of the change of the process of salt transport in an estuarine system. In general, salinity intrusion into the river mouth can be affected by many factors such as river water discharge and tidal level, as well as estuarine morphology. In this study, the response of salinity intrusion to the river mouth morphological changes induced by the 2011 Tsunami is investigated. The topographical changes caused by the tsunami are mainly divided into two stages. The first is the direct action of the tsunami, which caused the severe scouring of the coast and the widening of the river. The results have clearly indicated that after tsunami the salt water can intrude much further upstream compare to the condition before the tsunami event. Another changes occurred during the restoration process after the tsunami. The sediment accumulation in the river channel prevented the salt water from entering the river channel, which reduced the salt intrusion degree. However, the effect of the morphology change caused directly by the tsunami is far greater than the sedimentation of the river. Keywords: salinity intrusion; river morphology; tsunami impact; numerical simulation; EFDC model.

scholarly journals DYNAMIC MORPHOLOGICAL CHANGES OF SPIT IN APRIL–MAY 2014 IN OPAK RIVER MOUTH, BANTUL, DAERAH ISTIMEWA YOGYAKARTA

2015 ◽  
Vol 6 (2) ◽  
Author(s):  
Yan Restu Freski ◽  
Agung Setianto ◽  
Srijono Srijono
Keyword(s):  
Global Positioning System ◽  
Wind Direction ◽  
Morphological Changes ◽  
River Mouth ◽  
Field Work ◽  
Google Earth ◽  
Aerial Photographs ◽  
Ocean Energy ◽  
Global Positioning ◽  
Periodic Models

As an oceanic coast, the beaches in the southern part of Java Island are predominantly influenced by ocean energy which is driven by periodical monsoon. This periodical process impacts the dynamic changes of spit in the river mouth system. Therefore, spit is a key to study the process in the southern coast of Java Island especially in Opak River Mouth. It needs a deep-root explanation about the morphological changes and the sedimentological mechanism. This research project was built by data such as spit geometry, aerial photographs and spontaneous wind direction. The supporting data included multitemporal IKONOS-Quickbird images from Google Earth and aerial photographs. These data were collected from field-work investigation and laboratorywork. The spit geometry was compiled by Global Positioning System handheld tracking along the edge of spit and crosschecked by aerial photograph using pole. The ultimate interpretation and periodic models were built by data reconstruction based on the geometry of spit and spontaneous wind direction. Spit changed weekly due to monsoon transition in April to May 2014. The morphological changes could be noted as the spit starting to be cut off by the highrate flow of Opak River. The process continued until the net drift moving westward. Keywords: April, coast, May, Opak river mouth, spit.

scholarly journals PHÂN TÍCH BIẾN ĐỘNG ĐƯỜNG BỜ KHU VỰC BỜ BIỂN CỬA SÔNG HẬU BẰNG TƯ LIỆU VIỄN THÁM

2018 ◽  
Vol 17 (4) ◽  
pp. 386-392
Author(s):  
Nguyen Ngoc Tien ◽  
Do Huy Cuong ◽  
Dinh Van Uu ◽  
Nguyen Tho Sao ◽  
Tran Anh Tuan ◽  
...  
Keyword(s):  
Morphological Changes ◽  
River Mouth ◽  
Mekong Delta ◽  
Shoreline Change ◽  
Rate Of Change ◽  
River Mouth Area ◽  
Multi Temporal ◽  
Erosion Area ◽  
Analysis System ◽  
River Mouths

Multi-temporal Landsat data are used for this study over the period of 1989 to 2016 with imageries of 1989, 2001, 2009 and 2016. Band rationing method and threshold technique are applied for the coastline extraction. The Digital Shoreline Analysis System ENVI 5.1, eCognition and ArcGIS 10.3 are used to calculate shoreline rate-of-change statistics from multiple historical shoreline positions. The results show that shoreline change in the Hau river mouth area has a trend of deposition between 1989 and 2016 (27 years) with the accretion area ranging from 162.68 ha to 1,210.83 ha. Meanwhile, the erosion area only ranges from 0.002 ha to 183.53 ha. The results obtained from this study set a stage for new studies to understand the morphological changes of the river mouths in the Mekong Delta and coastal areas of Hau river.

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