![]() ![]() We suggest that the basin was persistently fed with a sediment load rich in mud aggregate produced in the vertic soils forming on the shales and limestones in the source area under a warm climate and seasonal rainfall. The sedimentary features of the thinner sheet-sandstone bodies associated with the mudrocks suggest that though the overall character of the fluvial system remained unchanged the sandstones were deposited during the phases of higher discharge. On the other hand, the small bodies of cross-bedded carbonate grainstones and laminated marls indicate that the conditions suitable for precipitation of freshwater carbonates prevailed in some of these swampy areas. However, evidence for accumulation of fines in swamp-like environments is preserved in a few pedogenically modified mudstones that occur in between much thicker intervals of stratified mudrocks. The internal organization of the mudrock units reveals that an admixture of pedogenic mud aggregates along with other sand-grade siliciclastic grains were transported through the channelized and unconfined reaches of a network of discontinuous ephemeral streams constituting the axial drainage of the rift basin. These mudrocks contain a large quantity of silt to fine-sand-size pedogenic mud aggregates, and the preserved primary structures indicate transportation by traction currents. We observe that the formation is dominated by stratified siltstone (mudrocks) rather than massive mudstones. These syn-rift sediments provide valuable clues towards understanding the spectrum of fluvial processes operating in continental rift-basins. With the help of petrographic and sedimentological features, this study characterizes the fluvial system that produced a deposit dominated by fines. However, though the fossil record and lithological characteristics of the Late Triassic Maleri Formation, Gondwana Supergroup of the Pranhita–Godavari continental rift basin, India, indicate that it is a fluvial deposit, the formation is characterized by thin sandstone bodies vertically separated by thicker fine-grained sediments. visual inspection of the flow states at different locations along the river) in the catchment, are also described.Finer-grained components of fluvial sediments are usually deposited in overbank environments, and their preservation in the rock record is generally subordinate to that of the coarser-grained channel fills. The monitoring network, including gauging stations and other types of observations (e.g. This section may describe the seasonal behaviour of the stream, observed long-term trends, locations with frequently observed zero-flow events along the river network, etc. A short description about the spatio-temporal pattern of zero-flow events. The second page is dedicated to the description and reasons for intermittence. Two panels display the hydrographs and flow durations curves, and a table gives metrics specific to river flow intermittence relevant for ecology. Intermittent and ephemeral streams comprise a large portion of the arid southwest, yet tools to assess stream health have so far only been available for. SMIRES brings together > 350 hydrologists. The first standardized page describes the main characteristics of the catchments (land-use, geology, climate, etc.) and the river flow regime. SMIRES is a COST Action addressing the Science and Management of Intermittent Rivers & Ephemeral Streams. Information on the selected gauged intermittent rivers and ephemeral streams is summarised in a two-page document: Introductory pages describe the procedures used to create the catalogue including definitions of the statistical measures reported for the individual intermittent rivers and ephemeral streams, and provide an overview of the catalogued water courses. The selected IRES are not meant to be representative of all intermittent water courses in Europe but rather highlight the variety in these water courses. A total of 40 examples have been put together in this catalogue to provide an overview of the variety of IRES in Europe. As part of this work, examples of intermittent rivers and ephemeral streams were collected across Europe, including gauged catchments with both natural and highly influenced river flow regimes. One of the tasks of WG1 was to compile flow gauging data at the European scale. The working group “Prevalence, distribution and trends of IRES” (WG1) has the central role to provide the physical basis of the SMIRES Action. This COST Action had brought together scientists from various research field and stakeholders to develop a European multidisciplinary network for synthesising the fragmented and recent knowledge on temporary water courses, improving our understanding of Intermittent Rivers and Ephemeral Streams (IRES) and translating this into a science-based, sustainable management of river networks. ![]() Abstract : SMIRES is a COST Action addressing the Science and Management of Intermittent Rivers & Ephemeral Streams (coord. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |