Dynamic Spatial Modeling of Urban Growth on the San Pedro Watershed

2003 ◽  
pp. 135-142
Author(s):  
Gary Whysong ◽  
Tasila Banda-Sakala ◽  
Betsy Conklin
Keyword(s):  
Urban Growth ◽  
Spatial Modeling ◽  
San Pedro

Sources of Perennial Water Supporting Critical Ecosystems, San Pedro Valley, Arizona

2020 ◽  
Vol 26 (4) ◽  
pp. 463-479
Author(s):  
Christopher J. Eastoe
Keyword(s):  
Urban Growth ◽  
Base Flow ◽  
Short Term ◽  
Deep Basin ◽  
San Pedro River ◽  
Limestone Aquifer ◽  
San Pedro ◽  
Groundwater Source ◽  
Groundwater Demand

ABSTRACT Stable O and H isotope data distinguish three sources for base flow in five reaches of the San Pedro River: (A) base flow and sub-flow from upstream reaches of the river; (B) bank storage derived from summer monsoon floodwater; and (C) water from the mountainous flanks of the river catchment. A and C support base flow in the sub-basin upstream of Sierra Vista. A, B, and C combine to support base flow near St. David. Source C in this area is ancient deep-basin groundwater. Source C dominates in Cascabel near Benson Narrows, with downstream additions from A. In Cascabel near Gamez Road, sources A and C combined to support base flow that had disappeared by 2019. Near Redington, source C appears to have operated through a limestone aquifer vulnerable to short-term drought. Groundwater sub-basins separated by impermeable sills in the riverbed are evolving into hydrologically separate sub-basins as base flow across the sills decreases. The decrease in base flow partly reflects regional long-term drought, which has been exacerbated by pumping. Additional groundwater demand from urban growth upstream of Benson is likely to cause further decline of base flow near St. David and Sierra Vista.

scholarly journals Assessment of Urban Growth Patterns using Spatio-temporal Data and Analysis

2019 ◽  
Vol 7 (5) ◽  
Author(s):  
Said Masoud Bakhit ◽  
Sbai Abdelkader
Keyword(s):  
Land Use ◽  
Urban Growth ◽  
Spatial Modeling ◽  
Urban Areas ◽  
Growth Patterns ◽  
Temporal Data ◽  
Spatial Trend ◽  
Growth Trends ◽  
Critical Issues ◽  
Spatio Temporal

Modeling urban growth trends has become one of the critical issues in the last decades. This study aims to evaluate spatio-temporal urban growth trends using spatial modeling. For this purpose, four land-use maps were used to visualize historical urban growth trends in Seremban, Malaysia. Land Change Modeller (LCM) was used to evaluate the spatial trend of Land-use and land-cover (LULC) in Seremban. The results of the study confirm that urban areas in Seremban hugely increased from 1984 to 2010. The main reasons to increase urban areas are that economic and population growth in Malaysia in general and Seremban in particular. This study confirms that the LCM model is one of the effective spatial techniques that should be taken into account in urban planning studies.

scholarly journals Revealing the Driving Forces of Mid-Cities Urban Growth Patterns Using Spatial Modeling: a Case Study of Los Ángeles, Chile

2007 ◽  
Vol 12 (1) ◽  
Author(s):  
Mauricio I. Aguayo ◽  
Thorsten Wiegand ◽  
Gerardo D. Azócar ◽  
Kerstin Wiegand ◽  
Claudia E. Vega
Keyword(s):  
Los Angeles ◽  
Urban Growth ◽  
Spatial Modeling ◽  
Driving Forces ◽  
Growth Patterns

Eco-efficiency Convergence and Green Urban Growth in China

2018 ◽  
Vol 42 (3-4) ◽  
pp. 307-334 ◽  
Author(s):  
Jianhuan Huang ◽  
Yue Hua
Keyword(s):  
Economic Growth ◽  
Urban Growth ◽  
Spatial Modeling ◽  
Geographical Location ◽  
Policy Implications ◽  
Data Envelopment ◽  
Chinese Cities ◽  
Efficiency Measures ◽  
Convergence Clubs ◽  
High Level

Eco-efficiency measures if economic growth and environmental protection are effectively balanced. To understand the path of green urban growth in China, this article examines the converging patterns of eco-efficiency for 191 Chinese cities within 2003 and 2013. Two types of modified Data Envelopment Analysis (DEA) methods and spatial modeling approach are adopted in empirical analyses, with cities grouped based on three types of heterogeneities that facilitate the formation of potential convergence clubs. We find that major Chinese cities are β-converging in their eco-efficiency scores and are forming place-based convergence clubs in terms of geographical location, environmental policy, and resource endowments. Less efficient clubs are converging at a faster speed toward low-level steady states, while more efficient clubs are reaching separate high-level equilibria with relatively slow rates and longer half-life. We further raise corresponding policy implications that aim at retarding or reversing the ongoing trend of eco-efficiency deterioration.

Processi territoriali: turismo e patrimonio a San Pedro de Atacama

TERRITORIO ◽  
2013 ◽  
pp. 132-138
Author(s):  
Barbara Tagliolini
Keyword(s):  
San Pedro

Sustentabilidad económica del cultivo de maíz (Zea mays L.) en Acambay, México

2019 ◽  
Vol 12 (11) ◽  
Author(s):  
Liliana Urbano-Castillo ◽  
Noe Flores-Hernández ◽  
Augusto Montiel-Castro ◽  
Rosy G. Cruz-Monterrosa ◽  
Mayra Díaz-Ramírez ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
San Pedro

Objetivo: evaluar la sustentabilidad económica del cultivo de maíz criollo (Zea mays L.) en Acambay, Estado de México. Diseño/metodología/aproximación: El área de estudio fue el municipio de Acambay, del estado de México. Se aplicó un cuestionario a 50 productores de maíz de los ejidos y comunidades agrarias de la Soledad, Pueblo Nuevo, Loma Linda, Dateje, San Pedro de los Metales, Dongú y Tixmadeje. El cuestionario se basó en el método de Indicadores de Sustentabilidad de Explotaciones Agropecuarias (IDEA). La selección de cada productor encuestado se realizó mediante el muestreo tipo bola de nieve, escogiendo el primer encuestado al azar. Resultados: El valor obtenido para el indicador “viabilidad económica” (C1) fue 1 de 20 puntos, indicando que la ganancia derivada del cultivo de maíz representa un salario mínimo. El indicador “tasa de especialización económica” (C2) obtuvo 0 puntos ya que solo se cultiva maíz, por lo tanto, representa una fuente de ingreso para los productores. En el indicador “autonomía financiera” (C3) el valor promedio obtenido fue 12 explicando que no existe una dependencia marcada en la compra de insumos externos para cultivar maíz. El indicador “sensibilidad a las ayudas del primer pilar de la política agrícola común” (C4) obtuvo 0 en promedio ya que la mayoría de los productores no reciben apoyos gubernamentales para cultivar maíz.  Limitaciones del estudio/implicaciones: los resultados presentados son avances de un análisis con más encuestados, por lo tanto, se sugiere tomar con cautela los resultados. Los indicadores “transmisión del capital” (C5) y “eficiencia de los procesos productivos” (C6) no se evaluaron adecuadamente ya que durante la aplicación de las encuestas los productores se negaron a proporcionar información detallada para evaluar estos indicadores. Hallazgos/conclusiones: la sustentabilidad económica calculada para los productores encuestados fue de 13% lo cual es muy baja, esto se debe principalmente a que éstos no siempre cuentan con el acceso a apoyos aplicables a la producción de maíz, otro factor que contribuye a la baja sustentabilidad es que el grano de maíz y los subproductos no se venden debido a bajos precios del mercado, por lo tanto, prefieren sembrar para autoconsumo, o para que los terrenos de cultivo heredados no estén ociosos.

Using Spatial Modeling to Improve Wetland Inventories in Great Smoky Mountains National Park

2019 ◽  
Vol 39 (4) ◽  
pp. 482
Author(s):  
Alix A. Pfennigwerth ◽  
Joshua Albritton ◽  
Troy Evans
Keyword(s):  
Spatial Modeling ◽  
National Park ◽  
Great Smoky Mountains ◽  
Smoky Mountains

Black Gold and Paradise

2015 ◽  
Vol 97 (3) ◽  
pp. 240-243
Author(s):  
Steven A. Preston
Keyword(s):  
Los Angeles ◽  
Gold Rush ◽  
San Pedro

The presence and use of petroleum in the Los Angeles area date back to prehistoric times. The automobile-driven Black Gold Rush of the 1890s fueled the emergence of Los Angeles and its port at San Pedro. But oil also had its downsides. The following speakers will address oil-based growth, problems, remedies, and culture.

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