scholarly journals Hyporheic exchange in sand dunes under a freely deforming river water surface

2021 ◽  
Author(s):  
Anzy Lee ◽  
Antoine F. Aubeneau ◽  
Xiaofeng Liu ◽  
M. Bayani Cardenas
Keyword(s):  
River Water ◽  
Water Surface ◽  
Sand Dunes ◽  
Hyporheic Exchange

scholarly journals PERENCANAAN LERENG SUNGAI SUGUTAMU PADA LOKASI PROYEK PESONA SQUARE DEPOK

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Putera Agung Maha Agung ◽  
Ramadhanty Saputri ◽  
Umar Alfaruqi Abdurrahman
Keyword(s):  
Slope Stability ◽  
River Water ◽  
Safety Factor ◽  
Water Surface ◽  
Surface Phase ◽  
The Road ◽  
Phase Slope ◽  
The People ◽  
Manual Calculation ◽  
Program Version

ABSTRACTThe location of inspection and vehicle road at Pesona Square Depok Project is on the side of Sugutamu River and contoured land giving a worried about sliding and erosion. This research was conducted for design the Slope of Sugutamu River At Pesona Square Depok Project which is effective, efficient, and gives comfort to the people there in using the road. Slope stability planning divided into 4 phase of calculation. Slope without outside load and not affected by river water surface phase, slope without outside load but affected by river water surface phase, slope with outside load but not affected by river water surface phase, and slope with outside load and affected by river water surface phase. The analysis uses two methods, manual analysis Fellenius methods and computer analysis PLAXIS program version 8.2. The shape and angle of the slope selected in this design is 60° and no-staging.. The value of minimum safety number from manual calculation of Fellenius method is 1,287 and PLAXIS program version 8.2 is 3,718. The value of the safety factor used is 1.25.Keywords: slope stability, safety factor, Fellenius method, PLAXIS version 8.2ABSTRAKLetak jalan inspeksi dan kendaraan pada Proyek Pesona Square Depok yang bersebelahan dengan Sungai Sugutamu dan bentuk tanah yang berkontur menimbulkan kekhawatiran akan terjadinya sliding dan erosi. Penelitian ini dilakukan untuk merencanakan lereng Sungai Sugutamu Pada Lokasi Proyek Pesona Square Depok yang efektif dan efisien serta memberikan kenyamanan kepada warga setempat dalam menggunakan jalan tersebut. Perencanaan stabilitas lereng dilakukan dalam empat fase perhitungan. Fase lereng dalam keadaan tanpa beban luar dan muka air sungai, fase lereng tanpa beban luar namun dipengaruhi muka air sungai, fase lereng dibebani beban luar namun tidak dipengaruhi muka air sungai, serta fase lereng dibebani beban luar dan dipengaruhi muka air sungai. Analisis menggunakan dua metode yaitu analisis manual metode Fellenius dan analisis komputer dengan program PLAXIS versi 8.2. Bentuk dan sudut kemiringan lereng yang dipilih dalam perencanaan ini yaitu sebesar 60˚dan tanpa undak (no-staging). Nilai angka keamanan terkecil yg didapat dari perhitungan manual metode Fellenius yaitu 1,287 dan program PLAXIS versi 8.2 sebesar 3,718. Nilai minimum faktor keamanan yang digunakan sebesar 1,25.Kata kunci : stabilitas lereng, faktor keamanan, metode Fellenius, PLAXIS versi 8.2

scholarly journals Temporal variations in river water surface elevation and slope captured by AirSWOT

2019 ◽  
Vol 224 ◽  
pp. 304-316 ◽  
Author(s):  
Elizabeth H. Altenau ◽  
Tamlin M. Pavelsky ◽  
Delwyn Moller ◽  
Lincoln H Pitcher ◽  
Paul D. Bates ◽  
...  
Keyword(s):  
River Water ◽  
Water Surface ◽  
Temporal Variations ◽  
Surface Elevation ◽  
Water Surface Elevation

Estimating reach-averaged discharge for the River Severn from measurements of river water surface elevation and slope

2014 ◽  
Vol 511 ◽  
pp. 92-104 ◽  
Author(s):  
Michael Durand ◽  
Jeffrey Neal ◽  
Ernesto Rodríguez ◽  
Konstantinos M. Andreadis ◽  
Laurence C. Smith ◽  
...  
Keyword(s):  
River Water ◽  
Water Surface ◽  
Surface Elevation ◽  
Water Surface Elevation

scholarly journals AirSWOT measurements of river water surface elevation and slope: Tanana River, AK

2017 ◽  
Vol 44 (1) ◽  
pp. 181-189 ◽  
Author(s):  
Elizabeth H. Altenau ◽  
Tamlin M. Pavelsky ◽  
Delwyn Moller ◽  
Christine Lion ◽  
Lincoln H. Pitcher ◽  
...  
Keyword(s):  
River Water ◽  
Water Surface ◽  
Surface Elevation ◽  
Water Surface Elevation

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Silicon Substitution for Calcium in the Shell of the Fingernail Clam, Musculium Transversum Studied By X-Ray Analysis

1980 ◽  
Vol 38 ◽  
pp. 560-561
Author(s):  
Judith A. Murphy ◽  
Anthony Paparo ◽  
Richard Sparks
Keyword(s):  
Carbonic Anhydrase ◽  
River Water ◽  
Food Chains ◽  
Well Water ◽  
Shell Formation ◽  
X Ray ◽  
Molluscan Shell ◽  
Fingernail Clams

Fingernail clams (Muscu1ium transversum) are dominant bottom-dwelling animals in some waters of the midwest U.S. These organisms are key links in food chains leading from nutrients in water and mud to fish and ducks which are utilized by man. In the mid-1950’s, fingernail clams disappeared from a 100-mile section of the Illinois R., a tributary of the Mississippi R. Some factor(s) in the river and/or sediment currently prevent clams from recolonizing areas where they were formerly abundant. Recently, clams developed shell deformities and died without reproducing. The greatest mortality and highest incidence of shell deformities appeared in test chambers containing the highest proportion of river water to well water. The molluscan shell consists of CaCO3, and the tissue concerned in its secretion is the mantle. The source of the carbonate is probably from metabolic CO2 and the maintenance of ionized Ca concentration in the mantle is controlled by carbonic anhydrase. The Ca is stored in extracellular concentric spherical granules(0.6-5.5μm) which represent a large amount of inertCa in the mantle. The purpose of this investigation was to examine the role of raw river water and well water on shell formation in the fingernail clam.

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