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| 1 | SCOUR MITIGATION AT BRIDGE PIERS USING SACRIFICIAL PILES显示文摘To mitigate scour around bridge piers, sacrificial piles are economic method where natural processes are involved. The arrangement should be such that scoured materials from the sacrificial piles should have enough volume to fill the scour hole created upstream of the pier in such a way that sediments are trapped inside the scour hole. This concept differs from earlier study made with sacrificial piles that mainly deals to reduce the strength of horseshoe vortex. To determine the effect of sacrificial piles for scour mitigation, alternative arrangements of piles were tested in front of a rectangular pier under clear-water condition and found that when the group of piles is placed at a distance of twice the projected width of the pier, for which percentage of blockage of the pier width is 60%, the scour volume can be reduced upto 61% while the maximum scour depth can be reduced upto 50%. | M. Anisul HAQUE Md. Munsur RAHMAN G.M. Tarekul ISLAM M. Asad HUSSAIN | 2007 | International Journal of Sediment Research2007，22，1： | 7 |
| 2 | LOCAL SCOUR ESTIMATION AT BRIDGE SITE: MODIFICATION AND APPLICATION OF LACEY FORMULA显示文摘In the recent years, it has been established that b/h or h/b (b = length of the structure in the lateral direction and h = approach flow depth) is the dominant factor for the estimation of local scour depth around abutments and piers. One of the major limitations of the Lacey formula is that it predicts only one value of the scour depth for a specific river because of the absence of important parameters b and h. Therefore, its application is quite uncertain for variable b and h. Considering its limitations and experimental facts of flow concentration and shear stress amplification close to above structures, the original Lacey formula is modified introducing the parameters b and h. The applicability of the original as well as modified Lacey formula is tested to the data collected from major rivers in Bangladesh. | Md. Munsur RAHMAN iwfm.buet.ac.bd at present: Post Doctoral Research fellow Ujigawa Open Laboratory Disaster Prevention Research Institute Kyoto University Shimomisu Yoko-Oji Fushimi-Ku Kyoto 612-8235 Japan M. Anisul HAQUE | 2003 | International Journal of Sediment Research2003，18，4： | 4 |
| 3 | Nutrient dynamics in the Sundarbans mangrove estuarine system of Bangladesh under different weather and tidal cycles显示文摘Introduction:Seasonal and tidal variations in nutrient concentration and water quality were investigated in the western Sundarbans of Bangladesh during the post-monsoon,winter and monsoon seasons during 2010–2011.Methods:Water collected from the surface,middle and bottom layers at six locations of the Kholpetua-Arpangashia river system during high and low tides was analyzed for temperature,salinity,pH,dissolved oxygen(DO),total dissolved solids(TDS),electrical conductivity(EC)and dissolved nutrients(NO3–N,PO4–P,SO4 and NH3–N).Results:The study revealed that nutrient concentrations were influenced by seasonal changes.Mean nutrient levels during post-monsoon,winter and monsoon seasons,respectively,were in the following ranges:nitrate(0.06–0.40,0.06–0.46 and 0.08–0.46 mg/L);phosphate(0.09–0.18,0.05–0.42 and 0.10–0.16 mg/L);sulphate(58.71–86.14,68.68–119.01 and 78.15–136.47 mg/L)and ammonia(0.02–0.08,0.02–0.04 and 0.26–0.38 mg/L).Increased levels of PO4–P,SO4 and NH3–N and lower DO and salinity were recorded during the monsoon period.Most of the experimental sites showed higher NO3–N content during monsoon,whereas few elevated concentrations were observed during post-monsoon and winter periods.High and low tidal waters contained mean nutrient levels in the following ranges:nitrate(0.05–0.46 and 0.04–0.40 mg/L);phosphate(0.05–0.42 and 0.07–0.18 mg/L);sulphate(63.63–125.36 and 58.71–136.47 mg/L)and ammonia(0.02–0.38 and 0.02–0.37 mg/L)without following any distinct fluctuation patterns.The western part of the Sundarbans receives less freshwater input during the monsoon season than other areas of the ecosystem,which reduces the variability of nutrient levels and water quality components.Conclusions:This study provides considerable advances in understanding the seasonality of nutrient distribution with possible tidal influence.The data generated from this study will guide continuing efforts to support a sound management for coastal mangrove ecosystems. | Shak Md Bazlur Rahaman Lipton Sarder Md Sayadur Rahaman Alokesh Kumar Ghosh Sudhin Kumar Biswas SM Shahjahan Siraj Khandaker Anisul Huq Abul Farah Md Hasanuzzaman Shikder Saiful Islam | 2013 | Ecological Processes2013，2，1： | 2 |
| 4 | SHEAR STRESS FOR INITIATION OF MOTION OF NON-UNIFORM SEDIMENT MIXTURES显示文摘Experiments on initiation of motion of different fractions of non-uniform sediment mixtures are reported. Four sediment mixes and reference transport method to define the threshold of bed particle movement are used in this analysis. Factors controlling the initiation of motion are analyzed. It is found that relative size of different grains with respect to a median size greatly affects the initiation of movement. The incipient motion of non-uniform sediment is very much dependent on the absolute size for coarser fractions. Considering the factors controlling the initiation of motion the experimental data sets along with the other available data yield a new relationship for the calculation of critical shear stress of non-uniform sediments. A set of equations have found that all the data points fall into a single line for the finer and for coarser fractions. | Liton Kumar SARKER M. Monowar HOSSAIN M. Anisul HAQUE | 2007 | International Journal of Sediment Research2007，22，3： | 2 |
| 5 | Modeling effects of interface traps on the gate C – V characteristics of MOS devices on alternative high-mobility substrates显示文摘 | Md. Mahbub Satter Anisul Haque | 2010 | Solid State Electronics2010，，： | 1 |
| 6 | Quantification of shallow water quality parameters by means of remote sensing 显示文摘 | Liu Y Anisul T M Jay G | 2003 | Progress in Physical Geography2003，27，1： | 1 |
| 7 | Age-dependent of apolipoprotein E genotypes with stroke subtypes in a Japanese rural population显示文摘 | Yoshihiro K Anisul HC Chigusa D | 2000 | Stroke2000，31，6： | 1 |
| 8 | A Relativistic Model for Strange Quark Star显示文摘 | Mehedi Kalam Anisul Ain Usmani Farook Rahaman S. Monowar Hossein Indrani Karar Ranjan Sharma | 2013 | International Journal of Theoretical Physics2013，，9： | 1 |
| 9 | Quantification of shallow water quality parameters by means of remote sensing显示文摘 | Liu Y Anisul T M Jay G | 2003 | Progress in Physical Geography2003，27，1： | 1 |
| 10 | Do low-ethylene- producing transgenic canola (Brassica napus) plants expressing the ACC deaminase gene differ from wild-type plants in response to UV-B radiation显示文摘 | Qaderi M M Anisul I M Reid D M | 2007 | Canadian Journal of Botany2007，85，2： | 1 |
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