نتایج جستجو برای: wetland
تعداد نتایج: 10233 فیلتر نتایج به سال:
this study was aimed to identify and mange the most stressful risks threatening shadegan international wetland. shadegan international wetland which is located in the southwest of iran is in the montero list and now threatened by several risks. in this study, the most important threatening risks of the wetland were identified. in the characteristics step, the risks were analyzed based on the se...
The Prairie Pothole Region (PPR) of North America is a globally important resource that provides abundant and valuable ecosystem goods and services in the form of biodiversity, groundwater recharge, water purification, flood attenuation, and water and forage for agriculture. Numerous studies have found these wetlands, which number in the millions, to be highly sensitive to climate variability. ...
This paper illustrates the role of plants to assist the treatment of water pollution in man-made wetlands in tropical and temperate climates. It also considers the potential for environmental education of these wetland systems. The management and natural treatment of pollution is described in the Mai Po Marshes, Hong Kong and a wetland in London which is also an important site for birds. The de...
Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker. This study, for the first time, utilize...
The construction of a wetland as a means of compensating for the loss of a natural wetland has been an operative practice in the management of the resource for many years. Generally, compensation by creation of new areas is a last resort in the mitigation sequencing used by wetlands management programs. Typically, development of a land parcel must first attempt to avoid any wetlands present. Wh...
0022-1694/$ see front matter 2012 Elsevier B.V. A doi:10.1016/j.jhydrol.2012.02.022 ⇑ Corresponding author. E-mail address: [email protected] (T.A. Russo). We present results of an observational and modeling study of the hydrologic response of a riparian wetland to controlled flooding. The study site is located in Poopenaut Valley, Yosemite National Park (USA), adjacent to the Tuolumne River. Thi...
Wetlands are the world’s largest natural source of methane, a powerful greenhouse gas. The strong sensitivity of methane emissions to environmental factors such as soil temperature and moisture has led to concerns about potential positive feedbacks to climate change. This risk is particularly relevant at high latitudes, which have experienced pronounced warming and where thawing permafrost coul...
The Anzali Ramsar Convention wetland is located in an ecologically and economically important region in Iran. The wetland is largely surrounded by agriculture, natural forests and rangelands (approximately 36% and 63%, respectively). Urban areas consist of less than 1% of the total area. Urban land use produces the highest rates of nutrient transfer into the lake as TN, TP and BOD5 equal to 24,...
Integrated Wetland and Landscape Modeling. A Case Study from the Eastern Cape Province, South Africa
Wetlands are very sensitive to ecosystem changes, so integrated analyses and modeling of their process dynamics as well as their interaction with other hydrologic and ecological components provide valuable information for impact assessment. However, since wetland processes are complex, research methods aiming to improve the understanding of wetland dynamics in a landscape perspective must compr...
Freshwater coastal prairie wetlands once covered large expanses of the Houston-Galveston landscape. A complex wetland matrix of mima mounds and low wetland basins known as prairie potholes provided important ecological services including habitat, lood control and water cleansing. Many of these areas were land leveled for agricultural and development purposes, erasing these features from the coa...
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