ISSN:0197-9337    

DOI:10.1002/esp.3290200902

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0197-9337    

DOI:10.1002/esp.3290200903

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractPortland Stone and Monks Park limestone tablets were used to assess weathering loss over a two‐year study. Procedures involved in preparing tablets for exposure, attaching them to the exposure frame and reweighing might have influenced weight changes measured. The impact of each stage in the above procedures was tested to assess how much weight loss was generated and how significant the loss was comparing the two stone types and the final loss sustained upon weathering. Although all the procedures seem to produce a statistically insignificant amount of weight loss, the two stone types do respond differently to the procedures. This suggests that stone properties may be important in determining the accuracy with which tablets can be used to assess spatial patterns of weatherin

ISSN:0197-9337    

DOI:10.1002/esp.3290200904

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThere are many problems associated with beach tracing and sand provenance in coastal studies over short and long timescales. Here, an attempt has been made to trace the source sediments of the beaches along the Holderness and Humberside coastline of northeast England, between Scarborough and Mablethorpe, using rapid field and laboratory magnetic techniques. The methodology employed involves classification and modelling of sediment sources and mixtures based on their magnetic properties. Focus is given to a strong ferrimagnetic black sand (heavy mineral) which dominates the magnetic signal of the beach mixtures. Delimiting the spatial extent, quantifying and tracing of this mineral may give a good indication of wave energy and sediment movement processes along this coastline. This paper represents results obtained during a short‐time‐scale sur

ISSN:0197-9337    

DOI:10.1002/esp.3290200905

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractDirect measurements of seabed stress are difficult, especially in field conditions. Several methods for estimating these stresses using current meter data are available. Two of these methods, the Inertial Dissipation Method and the Turbulent Kinetic Energy Method, are described below, and a Matlab program is used to analyse data from a wave‐current environmen

ISSN:0197-9337    

DOI:10.1002/esp.3290200906

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe Global Positioning System (GPS) is an established method for establishing high accuracy horizontal and vertical control points over large areas. Recent improvements in receiver technology, differential surveying and software have made the use of GPS technology more practical for smaller projects. This paper compares different GPS methods with occupation times of 2 s, 2 min and 12 min using an existing control network, and the gathering of topographic data from a difficult field site. Two examples are given, one in East Texas, demonstrating the speed and accuracy of different techniques, and the other in the Quantock Hills in Somerset.

ISSN:0197-9337    

DOI:10.1002/esp.3290200907

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper describes software to accompany McCarroll, D. 1993. ‘Modelling late‐Holocene snow‐avalanche activity: incorporating a new approach to lichenometry’,Earth Surface Processes and Landforms18, 527–539; and McCarroll, D., Matthews, J. A. and Shakesby, R. A. 1995. ‘Late‐Holocene snow‐avalanche activity in southern Norway: interpreting lichen‐size‐frequency distributions using an alternative to simulation modelling’,Earth Surface Processes and

ISSN:0197-9337    

DOI:10.1002/esp.3290200908

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe outcrop of groundwater on tidal beaches distinguishes an upper unsaturated region from a lower saturated region of the intertidal profile. Since the 1940s, it has been recognized that the extent of groundwater seepage at the beach face is one factor determining the tendency for erosive or accretionary conditions to prevail. As a primary step towards incorporating bed saturation characteristics within cross‐shore sediment transport models, this paper (and accompanying program disk) details a simple model to simulate the time‐varying extent of seepage face development across tidal beaches. From a comparison with field results obtained on the macrotidal Central Queensland (Australia) coast, the model appears to provide an encouraging degree of predictive capability. The model also assists in highlighting the sensitivity of seepage face development to varying beach face, tide and wave characterist

ISSN:0197-9337    

DOI:10.1002/esp.3290200909

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe Nahal Yatir Bedload Transport Database arises from the Northern Negev River Sediment Monitoring Programme and represents the first body of bedload information to be collected during flash floods in desert gravel‐bed streams. Bedload flux was established automatically with three slot‐samplers of the Birkbeck type. This was complemented by hydraulic measurements that allow sediment transport to be rated against channel average shear stress and specific stream power. Bed material and bedload grain‐size distributions are also provided. The database is given in both printed and electronic tabular f

ISSN:0197-9337    

DOI:10.1002/esp.3290200910

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe role of geomorphological research into sediment flux within modern dynamical systems and the consequent role of geomorphological research in the development of practical environmental management tools are seldom reconciled. Sediment fluxes can be estimated using instruments and numerical models, but problems arise when these results are to be interpreted to inform the environmental management debate. This paper presents one set of solutions in which we describe the work of the Humber Observatory and detail the concepts, instrumentation and software systems which have been developed to address such issues. The design and deployment of a new, automated meteorological station, new multiple sensor, radio‐linked outstations and the collection of associated tidal and bathymetric data are described, together with discussion of the operational problems and data archiving and output issues. We also describe the numerical models based upon the dynamical equations which have been used to estimate water and sediment fluxes through the Humber Estuary, and we describe the design criteria for new semi‐empirical models. Results from the various systems and models are presented as the basis for a regional research capability and in terms of operational delivery for environmental managem

ISSN:0197-9337    

DOI:10.1002/esp.3290200911

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY