Length-weight relationship of eleven species of marine catfishes from the northern Arabian Sea coast of Pakistan     

Farooq  Noureen  Qamar  Nazia  Rashid  Shahnaz  Panhwar  Sher Khan 《中国海洋湖沼学报》2017,35(5):1218-1220

This study records length-weight relationships(LWRs)for eleven commercially important marine catfi sh species of the family Ariidae(sea catfi shes)and Plotosidae(eel catfi shes)from the northern Arabian Sea coast of Pakistan.The specimens were sampled from December 2014 to November 2015,using bottom trawls with various mesh sizes by commercial vessels.The species were Nemapteryx caelatus,Sciades sona,Arius gagora,Batrachocephalus mino,Netuma thalassina,N.bilineata,Osteogeneiosus militaris,Plicofollis dussumieri,P.tenuispinis,Plotosus limbatus,and P.lineatus.Of the eleven species,two species A.gagora and N.bilineata were recorded for the fi rst time and LWRs for four species A.gagora,N.bilineata,S.sona,and B.mino still have no data in the Fish Base database.In addition,new maximum length for each of the three species N.bilineata,O.militaris and B.m ino was also found.  相似文献   

Groundwater flow modelling of Yamuna-Krishni interstream,a part of central Ganga Plain Uttar Pradesh   总被引：4，自引：0，他引：4  

Izrar Ahmed  Rashid Umar 《Journal of Earth System Science》2009,118(5):507-523

Groundwater is a major source of water for agricultural and domestic requirements in western Uttar Pradesh. Due to increasing agricultural requirements the abstraction of groundwater has increased manifold in the last two-to-three decades. The quaternary alluvium hosts the aquifer in the region. The study area forms a part of Yamuna-Krishni interfluve. Although the area hosts potential aquifers these have been adversely affected by poor management. For effective groundwater management of a basin it is essential that a careful water balance study should be carried out. Keeping this in mind groundwater flow modelling was attempted to simulate the behaviour of the flow system and evaluate the water balance. The groundwater flow modelling was carried out. The horizontal flows, seepage losses from unlined canals, recharge from rainfall and irrigation return flows were applied using different boundary packages available in Visual MODFLOW, Pro 4.1. The river-aquifer interaction was simulated using the river boundary package. Hydraulic conductivity values were applied to specific zones and these ranged from 9.8 to 26.6m/day. Recharge due to rainfall and irrigation returns were assigned to respective zones. Pumping rates of 500m³/day, 1000m³/day, 1500m³/day, 2000m³/day and 2500m³/day were applied to appropriate areas of the model to simulate areas of stress. The zone budget shows a water balance deficit for the period June 2006 to June 2007. The total recharge to the study area is 160.21 million m³ (Mcum). The groundwater draft through pumping is of the order of 233.56 Mcum, thus leaving a deficit balance of −73.35 Mcum. The sensitivity of the model to input parameters was tested by varying the parameters of interest over a range of values, monitoring the response of the model and determining the root mean square error of the simulated groundwater heads to the measured heads. These analyses showed that the model is most sensitive to hydraulic conductivity and recharge parameters. Three scenarios were considered to predict aquifer responses under varied conditions of groundwater bstraction.  相似文献   

The Genesis of Selected Hydrochemical Facies in Baton Rouge, Louisiana, Ground Waters     

Rashid A. Khan  Ray E. Ferrell  Gale K. Billings 《Ground water》1972,10(4):14-20

  相似文献   

Velocity and Structural Modeling of Mesozoic Chiltan Limestone and Goru Formation for Hydrocarbon Evaluation in the Bitrisim Area, Lower Indus Basin, Pakistan     

Sarfraz KHAN  Zahid LATIF  Muhammad HANIF  Irfan U. JAN  Shahid IQBAL 《《地质学报》英文版》2016,90(1):258-275

The present study focuses on building a workflow for structural interpretation and velocity modeling and implementing to Jurassic-Cretaceous succession (Chiltan Limestone and Massive sand of the Lower Goru Formation). 2D-Migrated seismic sections of the area are used as data set and in order to confirm the presence of hydrocarbons in the study area, P and S-wave seismic velocities are estimated from single-component seismic data. Some specific issues in the use of seismic data for modeling and hydrocarbon evaluation need to deal with including distinguishing the reservoir and cap rocks, and the effects of faults, folds and presence of hydrocarbons on these rocks. This study has carried out the structural interpretation and modeling of the seismic data for the identification of traps. The results demonstrate existence of appropriate structural traps in the form of horst and grabens in the area. 2D and 3D velocity modeling of the horizons indicates the presence of high velocity zones in the eastern half of the study while relatively low velocity zones are encountered in the western half of the area. Two wells were drilled in the study area (i.e. Fateh-01 and Ichhri-01) and both are dry. Immature hydrocarbons migration is considered as a failure reason for Fateh-01 and Ichhri-01 well.  相似文献   

Quality control and homogenization of daily meteorological data in the trans-boundary region of the Jhelum River basin     

Rashid Mahmood  Shaofeng Jia 《地理学报(英文版)》2016,26(12):1661-1674

Many studies such as climate variability, climate change, trend analysis, hydrological designs, agriculture decision-making etc. require long-term homogeneous datasets. Since homogeneous climate data is not available for climate analysis in Pakistan and India, the present study emphases on an extensive quality control and homogenization of daily maximum temperature, minimum temperature and precipitation data in the Jhelum River basin, Pakistan and India. A combination of different quality control methods and relative homogeneity tests were applied to achieve the objective of the study. To check the improvement after homogenization, correlation coefficients between the test and reference series calculated before and after the homogenization process were compared with each other. It was found that about 0.59%, 0.78% and 0.023% of the total data values are detected as outliers in maximum temperature, minimum temperature and precipitation data, respectively. About 32% of maximum temperature, 50% of minimum temperature and 7% of precipitation time series were inhomogeneous, in the Jhelum River basin. After the quality control and homogenization, 1% to 11% improvement was observed in the infected climate variables. This study concludes that precipitation daily time series are fairly homogeneous, except two stations (Naran and Gulmarg), and of a good quality. However, maximum and minimum temperature datasets require an extensive quality control and homogeneity check before using them into climate analysis in the Jhelum River basin.  相似文献   

Preventing and analysis of falling rocks: A case of Sarica village (Gürün,Turkey)     

Ali Polat  Inan Keskin  Irfan Denizli 《Journal of the Geological Society of India》2016,88(6):763-772

Rock fall is a common natural hazard causing significant damage to infrastructure and loss of life and property. This paper describes selection of prevention method, construction processes and the results of a rockfall hazard assessment for the village of Sarica (Gürün region, Turkey) based on an engineering-geological model. The study area is located on the lower parts of an area with very steep cliffs and 40-50⁰ slopes with fractured sedimentary and volcanic rocks. Detailed studies have been conducted in the region to prevent the risk of any rockfalls. Maps and charts are prepared including the rock blocks that are likely to fall and the related housing area under the risk. It was found that block sizes reached 3 m³. Rockfall analyses were performed along the selected profiles using the Rocfall V.5.0 software. Kinetic energy, bounce height, horizontal location of rock end-points and velocity of the rocks along each section were evaluated separately for each profile. This data was used to select design and construction of rockfall preventing system. In this study professional type rock fall barrier (catchment fence) was used. This method was chosen because it was cheaper, more practical and reliable than others.  相似文献   

Effect of magnesium chloride solution on the physico-chemical characteristics of tropical peat     

Nima Latifi  Ahmad Safuan A. Rashid  Aminaton Marto  Mahmood Md Tahir 《Environmental Earth Sciences》2016,75(3):220

  相似文献   

Assessment of toxicological health risk of trace metals in vegetables mostly consumed in Punjab,Pakistan     

Zafar Iqbal Khan  Kafeel Ahmad  Muhammad Ashraf  Nadia Shoaib  Rukhsana Parveen  Zahara Bibi  Irfan Mustafa  Ijaz Rasool Noorka  Hafiz Muhammad Tahir  Nudrat Aisha Akram  Muhammad Fahad Ullah  Rabia Yaqoob  Vincenzo Tufarelli  Mariano Fracchiolla  Eugenio Cazzato 《Environmental Earth Sciences》2016,75(5):433

  相似文献   

Impact analysis of climate change on Kolahoi Glacier in Liddar Valley,north-western Himalayas     

Syed Umer Latief  S. M. Rashid  Rupendra Singh 《Arabian Journal of Geosciences》2016,9(18):705

Glaciers are among the most conspicuous and dynamic features on the earth’s surface and are also highly sensitive to changes in climatic parameters. Glaciers in the Kashmir Himalayas have been reported to be retreating due to climate forcing. Kolahoi Glacier is one of the largest and important glaciers of the Kashmir Himalayas and is the main source of Liddar River, which is the largest tributary of the Jhelum River system. In the present study, an analysis to assess the response of Kolahoi Glacier to the changing climate was carried out using the Survey of India (SoI) map and multi-temporal Landsat satellite data. The results show a significant change in the spatial extent of Kolahoi Glacier. The total area of this glacier has reduced from 12.21 km² in 1962 to 11.61 km² in 2010. An analysis of meteorological data (temperature and precipitation) shows that the average annual temperature increased from 9.1 °C in 1980–1989 to 10.3 °C in 2000–2009, while the precipitation decreased from 1329.44 to 1126.89 mm during the same period. The results suggest that this glacier will be annihilated completely if the same retreating trend continues.  相似文献   

Revisiting major earthquakes in Pakistan          下载免费PDF全文

Irfan Mahmood  Aqeel Ahmed Kidwai  Shahid Nadeem Qureshi  Muhammad Farooq Iqbal  Luqman Atique 《Geology Today》2015,31(1):33-38

  相似文献