Electrical Structure of Yarlung Zangbo Suture from Magnetotelluric Profiling of INDEPTH-MT     

Tan Handong Jin Sheng Wei Wenbo Chen Leshou Deng Ming Department of Applied Geophysics  China University of Geosciences  Beijing  China John Booker Nong Wu Martyn Unsworth University of Washington  WA  USA Alan Jones Geological S 《中国地质大学学报(英文版)》2000,11(3)

INTRODUCTIONThe Qinghai- Xizang(Tibetan) plateau is the typical re-gion of the continent- continentcollision,convergence and con-solidation,which is still active now.Its uplifting has a closerelationship to the collision and consolidation of the India andEurasia plates.The Yarlung Zangbo suture is the final left-over after the collision and consolidation of the India andEurasia plates.Further research on the suture is of signifi-cance in studying the subduction,collision and last amalg…  相似文献   

Invigorating hydrological research through journal publications   总被引：1，自引：1，他引：0  

Nevil Quinn  Günter Blöschl  András Bárdossy  Attilio Castellarin  Martyn Clark  Christophe Cudennec 《水文科学杂志》2018,63(8):1113-1117

Editors of several journals in the field of hydrology met during the General Assembly of the European Geosciences Union—EGU in Vienna in April 2017. This event was a follow-up of similar meetings held in 2013 and 2015. These meetings enable the group of editors to review the current status of the journals and the publication process, and to share thoughts on future strategies. Journals were represented at the 2017 meeting by their editors, as shown in the list of authors. The main points on invigorating hydrological research through journal publications are communicated in this joint editorial published in the above journals.  相似文献   

Gridded climate data products are an alternative to instrumental measurements as inputs to rainfall–runoff models          下载免费PDF全文

José L.J. Ledesma  Martyn N. Futter 《水文研究》2017,31(18):3283-3293

Rainfall–runoff models are widely used to predict flows using observed (instrumental) time series of air temperature and precipitation as inputs. Poor model performance is often associated with difficulties in estimating catchment‐scale meteorological variables from point observations. Readily available gridded climate products are an underutilized source of temperature and precipitation time series for rainfall–runoff modelling, which may overcome some of the performance issues associated with poor‐quality instrumental data in small headwater monitoring catchments. Here we compare the performance of instrumental measured and E‐OBS gridded temperature and precipitation time series as inputs in the rainfall–runoff models “PERSiST” and “HBV” for flow prediction in six small Swedish catchments. For both models and most catchments, the gridded data produced statistically better simulations than did those obtained using instrumental measurements. Despite the high correspondence between instrumental and gridded temperature, both temperature and precipitation were responsible for the difference. We conclude that (a) gridded climate products such as the E‐OBS dataset could be more widely used as alternative input to rainfall–runoff models, even when instrumental measurements are available, and (b) the processing applied to gridded climate products appears to provide a more realistic approximation of small catchment‐scale temperature and precipitation patterns needed for flow simulations. Further research on this issue is needed and encouraged.  相似文献   

Quantification of bedform dynamics and bedload sediment flux in sandy braided rivers from airborne and satellite imagery     

Robert J.P. Strick  Philip J. Ashworth  Gregory H. Sambrook Smith  Andrew P. Nicholas  James L. Best  Stuart N. Lane  Daniel R. Parsons  Christopher J. Simpson  Christopher A. Unsworth  Jonathan Dale 《地球表面变化过程与地形》2019,44(4):953-972

Images from specially-commissioned aeroplane sorties (manned aerial vehicle, MAV), repeat unmanned aerial vehicle (UAV) surveys, and Planet CubeSat satellites are used to quantify dune and bar dynamics in the sandy braided South Saskatchewan River, Canada. Structure-from-Motion (SfM) techniques and application of a depth-brightness model are used to produce a series of Digital Surface Models (DSMs) at low and near-bankfull flows. A number of technical and image processing challenges are described that arise from the application of SfM in dry and submerged environments. A model for best practice is presented and analysis suggests a depth-brightness model approach can represent the different scales of bedforms present in sandy braided rivers with low-turbidity and shallow (< 2 m deep) water. The aerial imagery is used to quantify the spatial distribution of unit bar and dune migration rate in an 18 km reach and three ~1 km long reaches respectively. Dune and unit bar migration rates are highly variable in response to local variations in planform morphology. Sediment transport rates for dunes and unit bars, obtained by integrating migration rates (from UAV) with the volume of sediment moved (from DSMs using MAV imagery) show near-equivalence in sediment flux. Hence, reach-based sediment transport rate estimates can be derived from unit bar data alone. Moreover, it is shown that reasonable estimates of sediment transport rate can be made using just unit bar migration rates as measured from 2D imagery, including from satellite images, so long as informed assumptions are made regarding average bar shape and height. With recent availability of frequent, repeat satellite imagery, and the ease of undertaking repeat MAV and UAV surveys, for the first time, it may be possible to provide global estimates of bedload sediment flux for large or inaccessible low-turbidity rivers that currently have sparse information on bedload sediment transport rates. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.  相似文献