Results 11 to 20 of about 75 (71)
Evaluating the determinants of support for police militarization among officers
Politics &Policy, Volume 51, Issue 4, Page 636-660, August 2023., 2023 Abstract We evaluate the determinants of officer support for their agency participating in the 1033 Program: a program that facilitates the flow of military hardware to local law enforcement agencies. In doing so, we provide insight into why officers demand such equipment, which, in turn, may partially explain patterns of program participation and ...
Ryan M. Welch +3 more
wiley +1 more source
Integrated water resources management and the land‐water nexus: A South African perspective
World Water Policy, Volume 10, Issue 3, Page 755-779, August 2024.Abstract As a source of diffuse pollution, land use/land cover (LULC) can have profound impacts on water quality. Accordingly, the importance of managing the land‐water nexus is often emphasized in the rhetoric of Integrated Water Resources Management (IWRM).
Kent Anson Locke
wiley +1 more source
Shuitu Baochi Xuebao, 2004 LUCC(土地利用覆盖变化)对径流的影响研究主要集中在对年径流量的影响,选用基于ArcviewGIS的SWAT模型,利用情景模拟来分析土地利用变化对产流量和产沙量的影响,并重点探讨森林对产流的影响。以黄河下游支流洛河上游卢氏水文站以上流域为研究区域,选取了1992～2000年24个雨量站的雨量资料和同期的气象资料,采用土壤类型图(1∶4000000)以及设定的不同土地利用情景,作为模型的输入,进行土地利用变化的产流量和产沙量的情景模拟。模拟表明:森林的存在增加了径流量,减少了产沙量;草地也能减少产沙量 ...
郝芳华 陈利群 刘昌明 戴东
doaj +2 more sources
Shuitu Baochi Xuebao, 2022 为研究流域硝态氮来源、输出特征及驱动因素，应用SWAT模型对三峡库区梅溪河和大宁河流域径流和硝态氮负荷进行模拟，进而解析流域水文过程及硝态氮来源，并基于随机森林模型量化了不同影响因素（气候、土地利用、土壤类型、地形）对径流和硝态氮负荷的影响程度。结果表明：（1）不同土地利用类型间硝态氮负荷差异显著，年负荷强度表现为园地（20.41 kg/hm2）>旱地（12.51 kg/hm2）>水田（10.31 kg/hm2）>建设用地（7.09 kg/hm2）>林地（0.62 kg/hm2）>草地（0.46 kg ...
李乐 +5 more
doaj
Research progress in integrated groundwater-surface water models [PDF]
Groundwater-surface water interaction involves material transport and energy transfer processes, which directly impacts the hydro-ecological environment of watersheds.
Shuyan PENG +3 more
core +1 more source
The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau [PDF]
[Objective] The long-term variations of soil saturated hydraulic conductivity (Ks) and its primary controlling factors in terraces on the Loess Plateau were explored. [Methods] Terraces were selected for three land use types, i.e.
CHANG Heng +6 more
core +1 more source
Shuitu Baochi Xuebao, 2018 SWAT(Soil and Water Assessment Tool)模型是对大尺度复杂流域进行长时期水文模拟的重要工具，在水文循环、土壤侵蚀、污染物负荷、气候变化与土地利用变化的影响等方面得到广泛应用。SWAT模型在国内外流域模拟中取得良好的模拟效果，但不确定性问题普遍存在。从模型使用者的视角，针对输入数据的准备、子流域划分和输入数据尺度转换、模型参数校准3个SWAT模型应用的重要步骤，讨论了其主要不确定性来源。模型输入数据精度不足以准确反映其空间差异 ...
杨凯杰, 吕昌河
doaj
Shuitu Baochi Xuebao, 2021 以东江源为研究区，采用SWAT （Soil and Water Assessment Tool）模型，通过设置11种子流域划分方案，并保持土地利用和地形2个要素不变，以定量分析子流域划分引起的土壤离散化对产流产沙过程的影响。结果表明：（1）随着子流域数量的增加，土壤类型空间离散化趋势越明显，其中面积最大的泥红壤面积显著减少 ...
高怡婷 +4 more
doaj
Accumulation Characteristics and Hydrological Effects of Litter in Mixed Robinia pseudoacacia Plantations [PDF]
[Objective] Studying the accumulation characteristics and hydrological effects of typical mixed Robinia pseudoacacia plantations is crucial for deeply investigating the water conservation capacity of artificial forests on the Loess Plateau.
CAO Zetao +5 more
core +1 more source
Dynamic Linkage between Land-use and Water Quality in the Potomac River Basin and Its Management Implications [PDF]
, 2017 流域是一个具有特定结构和功能、相对独立完整的自然资源-生态环境-人类社会的复杂系统，承载了区域经济发展所需要的空间。人类及其他生物以其生活的流域作为物质依托，从中获取水、食物等物质资源和生活、娱乐、发展活动的空间资源。然而在社会经济高速发展的背景下，作为人类重要物质与空间依托的流域，其环境遭受来自各方面的多重影响因子的共同作用，其中以河流水质为主，正面临着日渐退化的趋势，因而保护人们赖以生存的环境迫在眉睫。很多人为因素包括城市化、农业活动、产业、污水排放都是影响河流水质的流域土地利用 ...
卞京
core