Shifting paradigms for Nepal’s protected areas: history,challenges and relationships     

Babu R. Bhattarai  Wendy Wright  Buddi S. Poudel  Achyut Aryal  Bhupendra P. Yadav  Radha Wagle 《山地科学学报》2017,14(5):964-979

The modern history of protected area (PA) management in Nepal dates back to 1973 when the National Parks and Wildlife Conservation Act (1973) was promulgated and Chitwan National Park was established. In the years immediately following these key events, protected area acts and regulations were strictly applied and the role of local people in managing natural resources was neglected. However with the passage of time, and with changes in the socio-political and economic characteristics of Nepal, management regimes have shifted towards a more liberal model which recognizes more clearly the contributions of people living and working within protected areas. Recently, landscape level conservation models including the designation of multiple use areas have been utilized in the development of management plans for protected areas in Nepal. Conservation agencies have attempted to tackle challenges such as land use conflict, poaching and smuggling of wildlife parts and illegal harvesting of highly valued medicinal herbs through regulation, but these efforts are not always successful. We recommend a holistic conflict resolution approach which recognizes and resolves the different needs of all stakeholders.  相似文献   

Effects of urban development on future multi-hazard risk: the case of Vancouver,Canada     

Chang  Stephanie E.  Yip  Jackie Z. K.  Tse  Wendy 《Natural Hazards》2019,98(1):251-265

Natural Hazards - Disaster risk reduction should anticipate how future natural hazard risk would be influenced by changes in urban vulnerability. This paper investigates the effect of one key...  相似文献   

Global Shadows: Africa in the Neoliberal World Order – A commentary     

Wendy Wolford 《Singapore journal of tropical geography》2008,29(3):266-269

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Tropical Hong Kong: Narratives of absence and presence in Hollywood and Hong Kong films of the 1950s and 1960s   总被引：1，自引：1，他引：0  

Wendy Gan 《Singapore journal of tropical geography》2008,29(1):8-23

Despite being subtropical, Hong Kong, in both Hollywood and Hong Kong films of the 1950s and 1960s, is often filmically represented as tropical. This subtle climatic elision, I argue, holds a particular political valence that varies according to filmic tradition. In Hollywood narratives, Hong Kong's tropicality is a means to exoticize and, ultimately, marginalize the realities of the local. It is a way to turn Hong Kong's physical presence into an absence. In Hong Kong films in that same cold war environment, the relative blandness of the city is an attempt to realign its film industry with the free nations of Southeast Asia. For Hong Kong films, the strategy of tropicalization was thus a means to turn away from China and redefine Hong Kong as part of a network of capitalist, modern, overseas Chinese cities located in the sunny tropics of Southeast Asia.  相似文献   

Vesiculation of high fountaining Hawaiian eruptions: episodes 15 and 16 of 1959 Kīlauea Iki     

Wendy K. Stovall  Bruce F. Houghton  Julia E. Hammer  Sarah A. Fagents  Don A. Swanson 《Bulletin of Volcanology》2012,74(2):441-455

The 1959 summit eruption of Kīlauea volcano produced the highest recorded Hawaiian fountain in Hawai‘i. Quantitative analysis of closely spaced samples from the final two high-fountaining episodes of the eruption result in a fine-scale textural study of pyroclasts and provide a record of postfragmentation processes. As clast vesicularity increases, the vesicle number density decreases and vesicle morphology shifts from small and round to larger and more irregular. The shift in microtexture corresponds to greater degrees of postfragmentation expansion of clasts with higher vesicularity. We suggest the range of clast morphologies in the deposit is related to thermal zonation within a Hawaiian fountain where the highest vesicularity clasts traveled in the center and lowest traveled along the margins. Vesicle number densities are greatest in the highest fountaining episode and therefore scale with intensity of activity. Major element chemical analyses and fasciculate crystal textures indicate microlite-rich zones within individual clasts are portions of recycled lava lake material that were incorporated into newly vesiculating primary melt.  相似文献   

Effect of simultaneous state–parameter estimation and forcing uncertainties on root-zone soil moisture for dynamic vegetation using EnKF     

Alejandro Monsivais-Huertero  Wendy D. Graham  Jasmeet Judge  Divya Agrawal 《Advances in water resources》2010

In this study, an EnKF-based assimilation algorithm was implemented to estimate root-zone soil moisture (RZSM) using the coupled LSP–DSSAT model during a growing season of corn. Experiments using both synthetic and field observations were conducted to understand effects of simultaneous state–parameter estimation, spatial and temporal update frequency, and forcing uncertainties on RZSM estimates. Estimating the state–parameters simultaneously with every 3-day assimilation of volumetric soil moisture (VSM) observations at 5 depths lowered the average standard deviation (ASD) and the root mean square error (RMSE) for RZSM by approximately 1.77% VSM (78%) and 2.18% VSM (93%), respectively, compared to the open-loop ASD where as estimating only states lowered the ASD by approximately 1.26% VSM (56%) and the RMSE by 1.66% VSM (71%). The synthetic case obtained RZSM estimates closer to the observations than the MicroWEX-2 case, particularly after precipitation/irrigation events. The differences in EnKF performance between MicroWEX-2 and synthetic observations may indicate other sources of errors in addition to those in parameters and forcings, such as errors in model biophysics.  相似文献   

Diel patterns in coastal‐stream nitrate concentrations linked to evapotranspiration in the riparian zone of a low‐relief,agricultural catchment          下载免费PDF全文

Samuel A. Flewelling  George M. Hornberger  Janet S. Herman  Aaron L. Mills  Wendy M. Robertson 《水文研究》2014,28(4):2150-2158

Evapotranspiration (ET) can cause diel fluctuations in the elevation of the water table and the stage in adjacent streams. The diel fluctuations of water levels change head gradients throughout the day, causing specific discharge through near‐stream sediment to fluctuate at the same time scale. In a previous study, we showed that specific discharge controls the residence time of groundwater in streambed sediment that, in turn, exerted the primary control on removal from groundwater passing through the streambed. In this study, we examine the magnitude of diel specific discharge patterns through the streambed driven by ET in the riparian zone with a transient numerical saturated–unsaturated groundwater flow model. On the basis of a first‐order kinetic model for removal, we predicted diel fluctuations in stream concentrations. Model results indicated that ET drove a diel pattern in specific discharge through the streambed and riparian zone (the removal zones). Because specific discharge is inversely proportional to groundwater travel time through the removal zones and travel time determines the extent of removal, diel changes in ET can result in a diel pattern in concentration in the stream. The model predictions generally matched observations made during summertime base‐flow conditions in a small coastal plain stream in Virginia. A more complicated pattern was observed following a seasonal drawdown period, where source components to the stream changed during the receding limb of the hydrograph and resulted in diel fluctuations being superimposed over a multi‐day trend in concentrations. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

A frozen record of density-driven crustal overturn in lava lakes: the example of Kīlauea Iki 1959     

Wendy K. Stovall  B. F. Houghton  A. J. L. Harris  D. A. Swanson 《Bulletin of Volcanology》2009,71(3):313-318

Lava lakes are found at basaltic volcanoes on Earth and other planetary bodies. Density-driven crustal foundering leading to surface renewal occurs repeatedly throughout the life of a lava lake. This process has been observed and described in a qualitative sense, but due to dangerous conditions, no data has been acquired to evaluate the densities of the units involved. Kīlauea Iki pit crater in Hawai`i houses a lava lake erupted during a 2 month period in 1959. Part of the surface of the Kīlauea Iki lake now preserves the frozen record of a final, incomplete, crustal-overturn cycle. We mapped this region and sampled portions of the foundering crust, as well as overriding and underlying lava, to constrain the density of the units involved in the overturn process. Overturn is driven by the advance of a flow front of fresh, low-density lava over an older, higher density surface crust. The advance of the front causes the older crust to break up, founder, and dive downwards into the lake to expose new, hot, low-density lava. We find density differences of 200 to 740 kg/m³ between the foundering crust and over-riding and under-lying lava respectively. In this case, crustal overturn is driven by large density differences between the foundering and resurfacing units. These differences lead, inevitably, to frequent crustal renewal: simple density differences between the surface crust and underlying lake lava make the upper layers of the lake highly unstable. Work originally presented at the American Geophysical Union Fall Meeting in San Francisco, California on December 11, 2007.  相似文献   

Spatially distributed denitrification in a karst springshed     

Wesley R. Henson  Matthew J. Cohen  Wendy D. Graham 《水文研究》2019,33(8):1191-1203

Karst spring measurements assess biogeochemical processes occurring within groundwater contributing areas to springs (springsheds) but can only provide aggregated information. To better understand spatially distributed processes that comprise these aggregated measures, we investigated aquifer denitrification evidence in groundwater wells (n = 16) distributed throughout a springshed in the Upper Floridan aquifer in northern Florida. Aquifer geochemistry, nitrate isotopes, and dissolved gases were compared against similar measurements at the spring outlet to evaluate spatial heterogeneity of denitrification evidence in relation to land surface–aquifer connectivity. Sample locations spanned spatial variation in recharge processes (i.e., diffuse vs. focused recharge) and proximity to sources of denitrification reactants (e.g., wetlands). Although no distinct spatial pattern in denitrification was uncovered, excess dissolved N₂ gas measurements were only above detection in the unconfined springshed, with some evidence of a wetland proximity effect. Measured oxidation–reduction potential and dissolved oxygen poorly predicted denitrification, indicating that measured denitrification may be occurring upgradient from sampled wells. Despite dramatic spatial chemical heterogeneity across wells, mean values for recharge nitrate concentrations (0.02 to 5.56 mg N L^?1) and excess N₂ from aquifer denitrification (below detection to 1.37 mg N L^?1) corresponded reasonably with mean spring outlet measurements for initial nitrate (0.78 to 1.36 mg N L^?1) and excess N₂ (0.15 to 1.04 mg N L^?1). Congruence between groundwater and spring measurements indicates that combining sampling at the spring outlet and across the springshed is useful for understanding spatial aquifer denitrification. However, this approach would be improved with a high‐density sampling network with transects of wells along distinct groundwater flow paths.  相似文献   

Creating a thinking space for the rising stars of Australian urban geography     

Dallas Rogers  Libby Porter  Wendy Steele  Donna Houston 《The Australian geographer》2019,50(2):141-143

The Institute of Australian Geographers Urban Study Group and Australian Geographer present the first essay in our Leading Insights/Thinking Space partnership. We discuss Dr Natalie Osborne's 2018 essay, flag Dr Marilu Melo's 2019 essay and talk about creating a thinking space for the rising stars of Australian urban geography.  相似文献