Watershed management

Xem 1-20 trên 61 kết quả Watershed management
  • Research over the past decade has demonstrated the feasibility of extracting topographic information of hydrological interest directly from digital elevation models (DEM). Techniques are available for extracting slope properties, catchment areas, drainage divides, channel networks and other data (Jenson and Domingue, 1988; Mark, 1988; Moore et al., 1991; Martz and Garbrecht, 1992). These techniques are faster and provide more precise and reproducible measurements than traditional manual techniques applied to topographic maps (Tribe, 1991)....

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  • Despite the tremendous progress that has been achieved in water pollution, almost 40% of the U.S. waters that have been assessed by states do not meet water quality goals. About 20,000 water bodies are impacted by siltation, nutrients, bacteria, oxygen depletion substances, metals, habitat alterations, pesticides, and toxic organic chemicals. With pollution from point sources being dramatically reduced, nonpoint source pollution is the major cause of most water that does not meet water quality goals.

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  • 12 Predictive Modeling of Lake Nitrogen, Phosphorus, and Sediment Concentrations Based on Land Use/Land Cover Type and Pattern Pariwate Varnakovida, Narumon Wiangwang, Joseph P. Messina, and Jiaguo Qi 12.1 INTRODUCTION In watershed management and planning, one of the major problems in lakes is the need to reduce nonpoint source pollution.1 Specific land use and land cover (LULC) types, such as “cropland” and “urban”, are associated with human activities and their physical characteristics often affect water quality.2 Land use practices and water resources are unequivocally linked.

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  • This publication has been designed to share IFAD’s experience with a broader public. It uses examples of instruments, processes and practices selected from IFAD’s project portfolio. The theme of IFAD’s 2001 portfolio review was the environment and natural resource management. Environment and Natural Resource Management: IFAD’s Growing Commitment draws extensively on that progress report, which was presented at the Seventy-Second Session of the IFAD Executive Board in April 2001.

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  • The Study Team will make and define a series of assumptions about future land use, urban development, climate, geomorphic processes, the agricultural drainage system, and watershed management in the MRB. These assumptions will be used as input variables in the model system to simulate future (some specified year, e.g., 2025) conditions. The small watershed, large watershed, and river water quality model systems will be used to simulate future (without projects or change in management) conditions of system hydrology, loading rates, and Minnesota River water quality conditions.

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  • Singapore carries out some of the most advanced and innovative water research across the whole water cycle. Leveraging on technologies and best management practices, Singapore is actively pursuing new technologies and processes to ensure security of supply to meet the ever-growing demands of its population and industry. This effort is spearheaded by PUB Singapore—the national water agency—and the Environment & Water Industry Programme Office established in May 2006 by the National Research Foundation.

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  • This volume, edited by John Gunn, Rob Steedman, and Dick Ryder, pulls together an incredibly broad mix of people and topics under a single cover. As such, it is a worthy addition to the new series from CRC Press — Integrative Studies in Water Management and Land Development — that was initiated in 2002 with publication of my own edited volume, Handbook of Water Sensitive Planning and Design . Books like these are rare, but they shouldn’t be.

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  • The Study Team will select a set of ecosystem services that will be affected by watershed management, aquatic ecosystem, and water quality restoration. The model system will be used to simulate the effects of management measures on the production of ecosystem services. Rules for the spatial effects by number, geographic location, and area (as appropriate) of application of management measures on the production of ecosystem services will be developed.

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  • A decision support system (DSS) will be developed, using the results of the MRB model system and other existing watershed DSSs to enable decision-making about investments in watershed management, aquatic ecosystem restoration, water quality, water quantity, and groundwater management measures in the MRB. The DSS will be explicitly designed to meet sponsor needs. The DSS will be linked to the Basin GIS to enable visualization of the spatial arrangement of management measures.

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  • Experience shows efficiency gains (Estonia, Samoa), the need for political will and support from community leaders for success (United Republic of Tanzania) but also shows that structures are most effective at the lower level and so should be built from the bottom up (Brazil). “Increased awareness and a decline in adverse agricultural practices have resulted from improved collaboration with the agriculture sector. There is still room however for improved dialogue between the water resources and agricultural sectors e.g clarity over watershed management roles.

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  • As a wetland of international importance located in China, the Poyang Lake Basin's incredible topographical and biological diversity has provided a congregating point for scientists from around the world to engage in cross-disciplinary research. In particular, the International Conference on Poyang Lake Complex Environment System was instrumental in bringing together scholars from China, North America, and Europe to explore the latest innovations in water resource science and watershed management.

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  • The primary purpose of preparing this edition is to provide an update. In the 14 years since the first edition was published, ecological risk assessment has gone from being a marginal activity to being a relatively mature practice. There are now standard frameworks and guidance documents in the United States and several other countries. Ecological risk assessment is applied to the regulation of chemicals, the remediation of contaminated sites, the importation of exotic organisms, the management of watersheds, and other environmental management problems....

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  • Salt marsh is an emergent, interdial estuarine wetland system characterized by persistent plant species such as cordgrass ( Spartina alterniflora ). Saltmarsh has a fringe geomorphic setting, and the water source and hydrodynamics are predominantly surface or near surface bidirectional flows.

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  • Environmental problems usually develop from the interactions of people, consumption, and resources. Increasing population, increasing consumption and limited resources exacerbate these problems. One concern that heads the list of critical problems is the availability of clean, fresh, surface water. It is the basis of the existence of human societies and economies. Fresh water is essential for many forms of life, is required by humans for drinking, agriculture, and most industrial processes, and plays a prominent role in our recreational activities....

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  • Nghiên cứu trong thập kỷ qua đã chứng minh tính khả thi của giải nén thông tin địa hình thuỷ văn trực tiếp từ lợi ích của mô hình kỹ thuật số độ cao (DEM). kỹ thuật được có sẵn cho tính độ dốc chiết xuất, khu vực lưu vực, phân chia, thoát nước, mạng lưới và kênh Các dữ liệu khác (Jenson và Domingue, 1988, Mark, 1988, Moore và cộng sự năm 1991;. Martz và Garbrecht, 1992).

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  • Nguồn ô nhiễm nước có thể được phân loại rộng rãi thành hai loại: điểm nguồn và các nguồn nonpoint. Nguồn điểm có thể dễ dàng xác định với công nghiệp các nguồn như sản xuất, chế biến, sản xuất điện, và xử lý chất thải các cơ sở nơi các chất ô nhiễm được phân phối thông qua một đường ống (điểm xả). trong Ngược lại, nonpoint, hoặc khuếch tán, các nguồn bao gồm các lĩnh vực như lĩnh vực nông nghiệp, bãi đậu xe rất nhiều, và các khóa học golf.

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  • Đánh giá hiệu suất của Phân đoạn đầu nguồn tự động từ Mô hình độ cao kỹ thuật số Đầu nguồn phân khúc và định nghĩa kênh IS mạng thường yêu cầu trong mô hình thủy văn phân phối. Bản đồ phân khúc tay từ IS là một công việc tẻ nhạt, tốn thời gian, và chủ quan, đặc biệt đối với lưu vực sông lớn.

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  • Trước những năm 1940, thuốc trừ sâu bao gồm các sản phẩm từ các nguồn tự nhiên như nicotine, cây kim cúc, dầu khí và dầu, rotenone, và các hóa chất vô cơ như lưu huỳnh, asen, chì, đồng, và vôi. Trong và sau chiến tranh thế giới thứ II, phenoxy Các thuốc diệt cỏ và thuốc trừ sâu organochlorine được sử dụng rộng rãi với sự phát hiện 2,4 dichlorophenoxyacetic acid (2-4-D) và dichlorodiphenyltrichloroethane (DDT).

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  • Khi phát triển một mô hình lượng mưa, dòng chảy phân phối sử dụng Mô hình độ cao kỹ thuật số, nó là quan trọng cần xem xét các phương pháp với một phân bố không gian của đại diện nào IS độ cao, vì bề mặt của một phương thức đại diện xác định cấu trúc của một mô hình lượng mưa, dòng chảy phân phối.

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  • Limitations on the availabilityof water resourcesareamong the greatest challenges facing modern society, despite the fact that roughly 70% of the earth’s surface is covered by water. Human society depends on liquid freshwater resources to meet drinking, sanitation and hy‐ giene, agriculture, and industry needs.Roughly 97% of the earth’s surface and shallow sub‐ surface water is saline and about 2% is frozen in glaciers and polar ice.

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