Author
Timothy O. Randhir
Other affiliations: Purdue University
Bio: Timothy O. Randhir is an academic researcher from University of Massachusetts Amherst. The author has contributed to research in topics: Watershed & Watershed management. The author has an hindex of 24, co-authored 92 publications receiving 1587 citations. Previous affiliations of Timothy O. Randhir include Purdue University.
Topics: Watershed, Watershed management, Land use, Surface runoff, Water quality
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors evaluated the influence of land use/land cover on water quality of tropical low-order streams, comparing watershed and riparian zone models, and found that forest cover plays a significant role in keeping water clean, while agriculture and urban areas lead to water quality degradation.
Abstract: Land-use/land-cover (LULC) pattern influences water quality, however, this relation may be different for various spatial scales. We evaluated the LULC effects on water quality of tropical low-order streams, comparing watershed and riparian zone models. Water quality parameters were analyzed separately and together using linear mixed and multivariate models. The results indicate that the forest cover plays a significant role in keeping water clean, while agriculture and urban areas lead to water quality degradation. Pasture land had mixed effects, but in general was not correlated with poor water quality. Dissolved oxygen, phosphorus, sediment, and fecal coliforms were influenced by LULC pattern at the watershed scale, while nitrogen and organic matter were more affected by the riparian zone composition. The water quality also varies with seasonal changes in streamflow and temperature. The overall water quality variation is explained better by the LULC composition within the watershed than in the riparian zone.
179 citations
TL;DR: In this article, the authors used a continuous simulation model to evaluate potential implications of increasing temperature on water quantity and quality at a regional scale in the Connecticut River Watershed of New England.
Abstract: Climate-induced increase in surface temperatures can impact hydrologic processes of a watershed system. This study uses a continuous simulation model to evaluate potential implications of increasing temperature on water quantity and quality at a regional scale in the Connecticut River Watershed of New England. The increase in temperature was modeled using Intergovernmental Panel on Climate Change (IPCC) high and low warming scenarios to incorporate the range of possible temperature change. It was predicted that climate change can have a significant affects on streamflow, sediment loading, and nutrient (nitrogen and phosphorus) loading in a watershed. Climate change also influences the timing and magnitude of runoff and sediment yield. Changes in variability of flows and pollutant loading that are induced by climate change have important implications on water supplies, water quality, and aquatic ecosystems of a watershed. Potential impacts of these changes include deficit supplies during peak seasons of water demand, increased eutrophication potential, and impacts on fish migration.
157 citations
TL;DR: An overview of the relationships between LULC and water quality in Brazil is provided, aiming at understanding the effects of different LULC types on water quality, how spatial and temporal scales contribute to these effects, and how such knowledge can improve watershed management and future projections.
118 citations
TL;DR: In this paper, a spatially explicit method to evaluate costs of harvesting and potential benefits in water harvesting in the Taunton River Watershed in Eastern Massachusetts, USA is developed, where a spatial analysis is used to assess surface storage and groundwater recharge potentials in developed and undeveloped regions of the watershed.
77 citations
TL;DR: In this paper, the authors conducted a survey to elicit responses from experts and decision makers serving the Florida Keys regarding vulnerability to global climate change and found that a large majority of respondents recognize the increasing likelihood of dynamic, potentially irreversible, socioeconomic and ecological repercussions.
73 citations
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TL;DR: A forum to review, analyze and stimulate the development, testing and implementation of mitigation and adaptation strategies at regional, national and global scales as mentioned in this paper, which contributes to real-time policy analysis and development as national and international policies and agreements are discussed.
Abstract: ▶ Addresses a wide range of timely environment, economic and energy topics ▶ A forum to review, analyze and stimulate the development, testing and implementation of mitigation and adaptation strategies at regional, national and global scales ▶ Contributes to real-time policy analysis and development as national and international policies and agreements are discussed and promulgated ▶ 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again
2,587 citations
1,327 citations
TL;DR: In this paper, the authors present the agronomical variables and plant traits that can be estimated by remote sensing, and describe the empirical and deterministic approaches to retrieve them, and provide a synthesis of the emerging opportunities that should strengthen the role of remote sensing in providing operational, efficient and long-term services for agricultural applications.
631 citations
Journal Article•
TL;DR: The results of the Forest Resources Assessment 2000 carried out by FAO are synthetically presented and discussed in this paper, which shows a general deceleration of the rate of net deforestation, that currently involves around 9 million hectares every year.
Abstract: The results of the Forest Resources Assessment 2000 carried out by FAO are synthetically presented and discussed. The world forest coverage is estimated equal to 38.6 million km 2 . The comparison of the estimates from the period 1990-2000 with those from the period 1980-1990 points out a certain general deceleration of the rate of net deforestation, that currently involves around 9 million hectares every year. However, the annua1 loss of tropical forests is still very large, while temperate and borea1 forests are in expansion. Overall, FRA2000 produced a relevant effort to compensate the existing technical, institutional and financial constraints and shortcomings for monitoring the world forest resources. The need to increase the quality and the frequency of forest surveys, both at national and international levels, s t a stands as a major issue to cope with.
600 citations
TL;DR: In this article, the authors reviewed the literature on leadership in linked social-ecological systems and combined it with the literature of institutional entrepreneurship in complex adaptive systems to develop a new theory of transformative agency.
Abstract: We reviewed the literature on leadership in linked social-ecological systems and combined it with the literature on institutional entrepreneurship in complex adaptive systems to develop a new theory of transformative agency in linked social- ecological systems. Although there is evidence of the importance of strategic agency in introducing innovation and transforming approaches to management and governance of such systems, there is no coherent theory to explain the wide diversity of strategies identified. Using Holling's adaptive cycle as a model of phases present in innovation and transformation of resilient social- ecological systems, overlaid by Dorado's model of opportunity context (opaque, hazy, transparent) in complex adaptive systems, we propose a more coherent theory of strategic agency, which links particular strategies, on the part of transformative agents, to phases of system change.
588 citations